Endocrinology

Meaningful weight loss was seen with the weight loss drugs Wegovy or Ozempic regardless of whether people had previous weight loss surgery, a first-of-its-kind study reveals.

In addition, insurance coverage/expense was the most common issue for people wishing to start the popular medications, known as GLP-1 receptor agonists. Side effects and drug shortages were among the reasons people stopped taking the medication.

Overall, people lost an average of 6% of their total body weight in almost 1 year of taking semaglutide, the class of drugs that includes Wegovy and Ozempic. When researchers compared people who had weight loss surgery with those who had not, total weight loss was almost identical: 5.8% in those who had surgery, vs 6.0% in those who had not.

People in this study lost a lower percentage of their total body weight, compared with people in clinical trials for the drugs, who tended to lose up to 15%, said lead investigator Pourya Medhati, MD, a postdoctoral research fellow at Brigham and Women’s Hospital in Boston.

These results suggest real-world weight loss results may be different than those in carefully controlled research studies. Dr. Medhati presented the findings at Digestive Disease Week® (DDW) 2024 in Washington.

Total weight loss was not significantly different between men and women in the surgery group. But in the nonsurgery group, women lost 6.4%, compared with 4.8% among men, a significant difference.

Dr. Medhati and Ali Tavakkoli, MD, chief of the Division of General and GI Surgery at Brigham and Women’s Hospital, used electronic health records to study 2491 adults prescribed semaglutide between 2018 and 2023 at Brigham and Women’s Hospital. Average age was 51, 74% were White, and 78% were women. A total of 13% had a history of weight loss surgery.
 

Costs, Side Effects, and Other Concerns

The investigators looked at issues around starting and staying on semaglutide in a subgroup of 500 patients. A total of 75 people never started the drug, for example. The majority, 72%, of this group said it was because of insurance coverage or the cost of the medication. Another 19% did not give a reason, and 9% said it was because of side effects.

People with higher body mass indexes and diabetes were less likely to start taking semaglutide, Dr. Medhati said.

Another 100 of the 500 patients started and then stopped semaglutide. Again, insurance coverage and cost were reasons, this time cited by 13%. About 36% stopped because of side effects; 21% pointed to a shortage of semaglutide; and 30% stopped for an unspecified reason.

“Our study highlights the importance of addressing insurance to ensure broader access,” Dr. Medhati said.

The 325 people who stayed on semaglutide lost an average of 8.5% of their total body weight at 50 weeks.
 

Access Remains Unequal

“These medications are incredibly powerful to treat obesity and weight-related disease both for people with a history of bariatric surgery and those without,” said session co-moderator Matthew Kroh, MD, vice chair of innovation and technology in the Department of General Surgery at Cleveland Clinic.

More equitable access to semaglutide and other GLP-1s is needed, he said. “Because the cost is so high and they’re not covered by most insurance plans at this point, people with better financial means have access to these medications,” while others may not.

Dr. Kroh said the findings may only apply to the patients, most of whom were female, White, and middle-aged. But he applauded the researchers for doing the study outside of a clinical trial. “Real-world data will help guide these decisions in the future,” he said.

A version of this article appeared on WebMD.com.

Meaningful weight loss was seen with the weight loss drugs Wegovy or Ozempic regardless of whether people had previous weight loss surgery, a first-of-its-kind study reveals.

In addition, insurance coverage/expense was the most common issue for people wishing to start the popular medications, known as GLP-1 receptor agonists. Side effects and drug shortages were among the reasons people stopped taking the medication.

Overall, people lost an average of 6% of their total body weight in almost 1 year of taking semaglutide, the class of drugs that includes Wegovy and Ozempic. When researchers compared people who had weight loss surgery with those who had not, total weight loss was almost identical: 5.8% in those who had surgery, vs 6.0% in those who had not.

People in this study lost a lower percentage of their total body weight, compared with people in clinical trials for the drugs, who tended to lose up to 15%, said lead investigator Pourya Medhati, MD, a postdoctoral research fellow at Brigham and Women’s Hospital in Boston.

These results suggest real-world weight loss results may be different than those in carefully controlled research studies. Dr. Medhati presented the findings at Digestive Disease Week® (DDW) 2024 in Washington.

Total weight loss was not significantly different between men and women in the surgery group. But in the nonsurgery group, women lost 6.4%, compared with 4.8% among men, a significant difference.

Dr. Medhati and Ali Tavakkoli, MD, chief of the Division of General and GI Surgery at Brigham and Women’s Hospital, used electronic health records to study 2491 adults prescribed semaglutide between 2018 and 2023 at Brigham and Women’s Hospital. Average age was 51, 74% were White, and 78% were women. A total of 13% had a history of weight loss surgery.
 

Costs, Side Effects, and Other Concerns

The investigators looked at issues around starting and staying on semaglutide in a subgroup of 500 patients. A total of 75 people never started the drug, for example. The majority, 72%, of this group said it was because of insurance coverage or the cost of the medication. Another 19% did not give a reason, and 9% said it was because of side effects.

People with higher body mass indexes and diabetes were less likely to start taking semaglutide, Dr. Medhati said.

Another 100 of the 500 patients started and then stopped semaglutide. Again, insurance coverage and cost were reasons, this time cited by 13%. About 36% stopped because of side effects; 21% pointed to a shortage of semaglutide; and 30% stopped for an unspecified reason.

“Our study highlights the importance of addressing insurance to ensure broader access,” Dr. Medhati said.

The 325 people who stayed on semaglutide lost an average of 8.5% of their total body weight at 50 weeks.
 

Access Remains Unequal

“These medications are incredibly powerful to treat obesity and weight-related disease both for people with a history of bariatric surgery and those without,” said session co-moderator Matthew Kroh, MD, vice chair of innovation and technology in the Department of General Surgery at Cleveland Clinic.

More equitable access to semaglutide and other GLP-1s is needed, he said. “Because the cost is so high and they’re not covered by most insurance plans at this point, people with better financial means have access to these medications,” while others may not.

Dr. Kroh said the findings may only apply to the patients, most of whom were female, White, and middle-aged. But he applauded the researchers for doing the study outside of a clinical trial. “Real-world data will help guide these decisions in the future,” he said.

A version of this article appeared on WebMD.com.

Meaningful weight loss was seen with the weight loss drugs Wegovy or Ozempic regardless of whether people had previous weight loss surgery, a first-of-its-kind study reveals.

In addition, insurance coverage/expense was the most common issue for people wishing to start the popular medications, known as GLP-1 receptor agonists. Side effects and drug shortages were among the reasons people stopped taking the medication.

Overall, people lost an average of 6% of their total body weight in almost 1 year of taking semaglutide, the class of drugs that includes Wegovy and Ozempic. When researchers compared people who had weight loss surgery with those who had not, total weight loss was almost identical: 5.8% in those who had surgery, vs 6.0% in those who had not.

People in this study lost a lower percentage of their total body weight, compared with people in clinical trials for the drugs, who tended to lose up to 15%, said lead investigator Pourya Medhati, MD, a postdoctoral research fellow at Brigham and Women’s Hospital in Boston.

These results suggest real-world weight loss results may be different than those in carefully controlled research studies. Dr. Medhati presented the findings at Digestive Disease Week® (DDW) 2024 in Washington.

Total weight loss was not significantly different between men and women in the surgery group. But in the nonsurgery group, women lost 6.4%, compared with 4.8% among men, a significant difference.

Dr. Medhati and Ali Tavakkoli, MD, chief of the Division of General and GI Surgery at Brigham and Women’s Hospital, used electronic health records to study 2491 adults prescribed semaglutide between 2018 and 2023 at Brigham and Women’s Hospital. Average age was 51, 74% were White, and 78% were women. A total of 13% had a history of weight loss surgery.
 

Costs, Side Effects, and Other Concerns

The investigators looked at issues around starting and staying on semaglutide in a subgroup of 500 patients. A total of 75 people never started the drug, for example. The majority, 72%, of this group said it was because of insurance coverage or the cost of the medication. Another 19% did not give a reason, and 9% said it was because of side effects.

People with higher body mass indexes and diabetes were less likely to start taking semaglutide, Dr. Medhati said.

Another 100 of the 500 patients started and then stopped semaglutide. Again, insurance coverage and cost were reasons, this time cited by 13%. About 36% stopped because of side effects; 21% pointed to a shortage of semaglutide; and 30% stopped for an unspecified reason.

“Our study highlights the importance of addressing insurance to ensure broader access,” Dr. Medhati said.

The 325 people who stayed on semaglutide lost an average of 8.5% of their total body weight at 50 weeks.
 

Access Remains Unequal

“These medications are incredibly powerful to treat obesity and weight-related disease both for people with a history of bariatric surgery and those without,” said session co-moderator Matthew Kroh, MD, vice chair of innovation and technology in the Department of General Surgery at Cleveland Clinic.

More equitable access to semaglutide and other GLP-1s is needed, he said. “Because the cost is so high and they’re not covered by most insurance plans at this point, people with better financial means have access to these medications,” while others may not.

Dr. Kroh said the findings may only apply to the patients, most of whom were female, White, and middle-aged. But he applauded the researchers for doing the study outside of a clinical trial. “Real-world data will help guide these decisions in the future,” he said.

A version of this article appeared on WebMD.com.

According to the Centers for Disease Control and Prevention (CDC), over 684,000 Americans are diagnosed with an “obesity-associated” cancer each year.

The incidence of many of these cancers has been rising in recent years, particularly among younger people — a trend that sits in contrast with the overall decline in cancers with no established relationship to excess weight, such as lung and skin cancers. 

Is obesity the new smoking? Not exactly.

Tracing a direct line between excess fat and cancer is much less clear-cut than it is with tobacco. While about 42% of cancers — including common ones such as colorectal and postmenopausal breast cancers — are considered obesity-related, only about 8% of incident cancers are attributed to excess body weight. People often develop those diseases regardless of weight.

Although plenty of evidence points to excess body fat as a cancer risk factor, it’s unclear at what point excess weight has an effect. Is gaining weight later in life, for instance, better or worse for cancer risk than being overweight or obese from a young age?

There’s another glaring knowledge gap: Does losing weight at some point in adulthood change the picture? In other words, how many of those 684,000 diagnoses might have been prevented if people shed excess pounds?

When it comes to weight and cancer risk, “there’s a lot we don’t know,” said Jennifer W. Bea, PhD, associate professor, health promotion sciences, University of Arizona, Tucson.

A Consistent but Complicated Relationship

Given the growing incidence of obesity — which currently affects about 42% of US adults and 20% of children and teenagers — it’s no surprise that many studies have delved into the potential effects of excess weight on cancer rates.

Although virtually all the evidence comes from large cohort studies, leaving the cause-effect question open, certain associations keep showing up.

“What we know is that, consistently, a higher body mass index [BMI] — particularly in the obese category — leads to a higher risk of multiple cancers,” said Jeffrey A. Meyerhardt, MD, MPH, codirector, Colon and Rectal Cancer Center, Dana-Farber Cancer Institute, Boston.

In a widely cited report published in The New England Journal of Medicine in 2016, the International Agency for Research on Cancer (IARC) analyzed over 1000 epidemiologic studies on body fat and cancer. The agency pointed to over a dozen cancers, including some of the most common and deadly, linked to excess body weight.

That list includes esophageal adenocarcinoma and endometrial cancer — associated with the highest risk — along with kidney, liver, stomach (gastric cardia), pancreatic, colorectal, postmenopausal breast, gallbladder, ovarian, and thyroid cancers, plus multiple myeloma and meningioma. There’s also “limited” evidence linking excess weight to additional cancer types, including aggressive prostate cancer and certain head and neck cancers.

At the same time, Dr. Meyerhardt said, many of those same cancers are also associated with issues that lead to, or coexist with, overweight and obesity, including poor diet, lack of exercise, and metabolic conditions such as diabetes. 

It’s a complicated web, and it’s likely, Dr. Meyerhardt said, that high BMI both directly affects cancer risk and is part of a “causal pathway” of other factors that do.

Regarding direct effects, preclinical research has pointed to multiple ways in which excess body fat could contribute to cancer, said Karen M. Basen-Engquist, PhD, MPH, professor, Division of Cancer Prevention and Population Services, The University of Texas MD Anderson Cancer Center, Houston.

One broad mechanism to help explain the obesity-cancer link is chronic systemic inflammation because excess fat tissue can raise levels of substances in the body, such as tumor necrosis factor alpha and interleukin 6, which fuel inflammation. Excess fat also contributes to hyperinsulinemia — too much insulin in the blood — which can help promote the growth and spread of tumor cells. 

But the underlying reasons also appear to vary by cancer type, Dr. Basen-Engquist said. With hormonally driven cancer types, such as breast and endometrial, excess body fat may alter hormone levels in ways that spur tumor growth. Extra fat tissue may, for example, convert androgens into estrogens, which could help feed estrogen-dependent tumors.

That, Dr. Basen-Engquist noted, could be why excess weight is associated with postmenopausal, not premenopausal, breast cancer: Before menopause, body fat is a relatively minor contributor to estrogen levels but becomes more important after menopause.

How Big Is the Effect?

While more than a dozen cancers have been consistently linked to excess weight, the strength of those associations varies considerably. 

Endometrial and esophageal cancers are two that stand out. In the 2016 IARC analysis, people with severe obesity had a seven-times greater risk for endometrial cancer and 4.8-times greater risk for esophageal adenocarcinoma vs people with a normal BMI.

With other cancers, the risk increases for those with severe obesity compared with a normal BMI were far more modest: 10% for ovarian cancer, 30% for colorectal cancer, and 80% for kidney and stomach cancers, for example. For postmenopausal breast cancer, every five-unit increase in BMI was associated with a 10% relative risk increase.

A 2018 study from the American Cancer Society, which attempted to estimate the proportion of cancers in the United States attributable to modifiable risk factors — including alcohol consumption, ultraviolet rays exposure, and physical inactivity — found that smoking accounted for the highest proportion of cancer cases by a wide margin (19%), but excess weight came in second (7.8%).

Again, weight appeared to play a bigger role in certain cancers than others: An estimated 60% of endometrial cancers were linked to excess weight, as were roughly one third of esophageal, kidney, and liver cancers. At the other end of the spectrum, just over 11% of breast, 5% of colorectal, and 4% of ovarian cancers were attributable to excess weight.

Even at the lower end, those rates could make a big difference on the population level, especially for groups with higher rates of obesity.

CDC data show that obesity-related cancers are rising among women younger than 50 years, most rapidly among Hispanic women, and some less common obesity-related cancers, such as stomach, thyroid and pancreatic, are also rising among Black individuals and Hispanic Americans.

Obesity may be one reason for growing cancer disparities, said Leah Ferrucci, PhD, MPH, assistant professor, epidemiology, Yale School of Public Health, New Haven, Connecticut. But, she added, the evidence is limited because Black individuals and Hispanic Americans are understudied.

When Do Extra Pounds Matter?

When it comes to cancer risk, at what point in life does excess weight, or weight gain, matter? Is the standard weight gain in middle age, for instance, as hazardous as being overweight or obese from a young age?

Some evidence suggests there’s no “safe” time for putting on excess pounds.

A recent meta-analysis concluded that weight gain at any point after age 18 years is associated with incremental increases in the risk for postmenopausal breast cancer. A 2023 study in JAMA Network Open found a similar pattern with colorectal and other gastrointestinal cancers: People who had sustained overweight or obesity from age 20 years through middle age faced an increased risk of developing those cancers after age 55 years. 

The timing of weight gain didn’t seem to matter either. The same elevated risk held among people who were normal weight in their younger years but became overweight after age 55 years.

Those studies focused on later-onset disease. But, in recent years, experts have tracked a troubling rise in early-onset cancers — those diagnosed before age 50 years — particularly gastrointestinal cancers. 

An obvious question, Dr. Meyerhardt said, is whether the growing prevalence of obesity among young people is partly to blame.

There’s some data to support that, he said. An analysis from the Nurses’ Health Study II found that women with obesity had double the risk for early-onset colorectal cancer as those with a normal BMI. And every 5-kg increase in weight after age 18 years was associated with a 9% increase in colorectal cancer risk.

But while obesity trends probably partly explain the rise in early-onset cancers, there is likely more to the story, Dr. Meyerhardt said.

“I think all of us who see an increasing number of patients under 50 with colorectal cancer know there’s a fair number who do not fit that [high BMI] profile,” he said. “There’s a fair number over 50 who don’t either.”

Does Weight Loss Help?

With all the evidence pointing to high BMI as a cancer risk factor, a logical conclusion is that weight loss should reduce that excess risk. However, Dr. Bea said, there’s actually little data to support that, and what exists comes from observational studies.

Some research has focused on people who had substantial weight loss after bariatric surgery, with encouraging results. A study published in JAMA found that among 5053 people who underwent bariatric surgery, 2.9% developed an obesity-related cancer over 10 years compared with 4.9% in the nonsurgery group.

Most people, however, aim for less dramatic weight loss, with the help of diet and exercise or sometimes medication. Some evidence shows that a modest degree of weight loss may lower the risks for postmenopausal breast and endometrial cancers. 

A 2020 pooled analysis found, for instance, that among women aged ≥ 50 years, those who lost as little as 2.0-4.5 kg, or 4.4-10.0 pounds, and kept it off for 10 years had a lower risk for breast cancer than women whose weight remained stable. And losing more weight — 9 kg, or about 20 pounds, or more — was even better for lowering cancer risk.

But other research suggests the opposite. A recent analysis found that people who lost weight within the past 2 years through diet and exercise had a higher risk for a range of cancers compared with those who did not lose weight. Overall, though, the increased risk was quite low.

Whatever the research does, or doesn’t, show about weight and cancer risk, Dr. Basen-Engquist said, it’s important that risk factors, obesity and otherwise, aren’t “used as blame tools.”

“With obesity, behavior certainly plays into it,” she said. “But there are so many influences on our behavior that are socially determined.”

Both Dr. Basen-Engquist and Dr. Meyerhardt said it’s important for clinicians to consider the individual in front of them and for everyone to set realistic expectations. 

People with obesity should not feel they have to become thin to be healthier, and no one has to leap from being sedentary to exercising several hours a week. 

“We don’t want patients to feel that if they don’t get to a stated goal in a guideline, it’s all for naught,” Dr. Meyerhardt said.

A version of this article appeared on Medscape.com.

According to the Centers for Disease Control and Prevention (CDC), over 684,000 Americans are diagnosed with an “obesity-associated” cancer each year.

The incidence of many of these cancers has been rising in recent years, particularly among younger people — a trend that sits in contrast with the overall decline in cancers with no established relationship to excess weight, such as lung and skin cancers. 

Is obesity the new smoking? Not exactly.

Tracing a direct line between excess fat and cancer is much less clear-cut than it is with tobacco. While about 42% of cancers — including common ones such as colorectal and postmenopausal breast cancers — are considered obesity-related, only about 8% of incident cancers are attributed to excess body weight. People often develop those diseases regardless of weight.

Although plenty of evidence points to excess body fat as a cancer risk factor, it’s unclear at what point excess weight has an effect. Is gaining weight later in life, for instance, better or worse for cancer risk than being overweight or obese from a young age?

There’s another glaring knowledge gap: Does losing weight at some point in adulthood change the picture? In other words, how many of those 684,000 diagnoses might have been prevented if people shed excess pounds?

When it comes to weight and cancer risk, “there’s a lot we don’t know,” said Jennifer W. Bea, PhD, associate professor, health promotion sciences, University of Arizona, Tucson.

A Consistent but Complicated Relationship

Given the growing incidence of obesity — which currently affects about 42% of US adults and 20% of children and teenagers — it’s no surprise that many studies have delved into the potential effects of excess weight on cancer rates.

Although virtually all the evidence comes from large cohort studies, leaving the cause-effect question open, certain associations keep showing up.

“What we know is that, consistently, a higher body mass index [BMI] — particularly in the obese category — leads to a higher risk of multiple cancers,” said Jeffrey A. Meyerhardt, MD, MPH, codirector, Colon and Rectal Cancer Center, Dana-Farber Cancer Institute, Boston.

In a widely cited report published in The New England Journal of Medicine in 2016, the International Agency for Research on Cancer (IARC) analyzed over 1000 epidemiologic studies on body fat and cancer. The agency pointed to over a dozen cancers, including some of the most common and deadly, linked to excess body weight.

That list includes esophageal adenocarcinoma and endometrial cancer — associated with the highest risk — along with kidney, liver, stomach (gastric cardia), pancreatic, colorectal, postmenopausal breast, gallbladder, ovarian, and thyroid cancers, plus multiple myeloma and meningioma. There’s also “limited” evidence linking excess weight to additional cancer types, including aggressive prostate cancer and certain head and neck cancers.

At the same time, Dr. Meyerhardt said, many of those same cancers are also associated with issues that lead to, or coexist with, overweight and obesity, including poor diet, lack of exercise, and metabolic conditions such as diabetes. 

It’s a complicated web, and it’s likely, Dr. Meyerhardt said, that high BMI both directly affects cancer risk and is part of a “causal pathway” of other factors that do.

Regarding direct effects, preclinical research has pointed to multiple ways in which excess body fat could contribute to cancer, said Karen M. Basen-Engquist, PhD, MPH, professor, Division of Cancer Prevention and Population Services, The University of Texas MD Anderson Cancer Center, Houston.

One broad mechanism to help explain the obesity-cancer link is chronic systemic inflammation because excess fat tissue can raise levels of substances in the body, such as tumor necrosis factor alpha and interleukin 6, which fuel inflammation. Excess fat also contributes to hyperinsulinemia — too much insulin in the blood — which can help promote the growth and spread of tumor cells. 

But the underlying reasons also appear to vary by cancer type, Dr. Basen-Engquist said. With hormonally driven cancer types, such as breast and endometrial, excess body fat may alter hormone levels in ways that spur tumor growth. Extra fat tissue may, for example, convert androgens into estrogens, which could help feed estrogen-dependent tumors.

That, Dr. Basen-Engquist noted, could be why excess weight is associated with postmenopausal, not premenopausal, breast cancer: Before menopause, body fat is a relatively minor contributor to estrogen levels but becomes more important after menopause.

How Big Is the Effect?

While more than a dozen cancers have been consistently linked to excess weight, the strength of those associations varies considerably. 

Endometrial and esophageal cancers are two that stand out. In the 2016 IARC analysis, people with severe obesity had a seven-times greater risk for endometrial cancer and 4.8-times greater risk for esophageal adenocarcinoma vs people with a normal BMI.

With other cancers, the risk increases for those with severe obesity compared with a normal BMI were far more modest: 10% for ovarian cancer, 30% for colorectal cancer, and 80% for kidney and stomach cancers, for example. For postmenopausal breast cancer, every five-unit increase in BMI was associated with a 10% relative risk increase.

A 2018 study from the American Cancer Society, which attempted to estimate the proportion of cancers in the United States attributable to modifiable risk factors — including alcohol consumption, ultraviolet rays exposure, and physical inactivity — found that smoking accounted for the highest proportion of cancer cases by a wide margin (19%), but excess weight came in second (7.8%).

Again, weight appeared to play a bigger role in certain cancers than others: An estimated 60% of endometrial cancers were linked to excess weight, as were roughly one third of esophageal, kidney, and liver cancers. At the other end of the spectrum, just over 11% of breast, 5% of colorectal, and 4% of ovarian cancers were attributable to excess weight.

Even at the lower end, those rates could make a big difference on the population level, especially for groups with higher rates of obesity.

CDC data show that obesity-related cancers are rising among women younger than 50 years, most rapidly among Hispanic women, and some less common obesity-related cancers, such as stomach, thyroid and pancreatic, are also rising among Black individuals and Hispanic Americans.

Obesity may be one reason for growing cancer disparities, said Leah Ferrucci, PhD, MPH, assistant professor, epidemiology, Yale School of Public Health, New Haven, Connecticut. But, she added, the evidence is limited because Black individuals and Hispanic Americans are understudied.

When Do Extra Pounds Matter?

When it comes to cancer risk, at what point in life does excess weight, or weight gain, matter? Is the standard weight gain in middle age, for instance, as hazardous as being overweight or obese from a young age?

Some evidence suggests there’s no “safe” time for putting on excess pounds.

A recent meta-analysis concluded that weight gain at any point after age 18 years is associated with incremental increases in the risk for postmenopausal breast cancer. A 2023 study in JAMA Network Open found a similar pattern with colorectal and other gastrointestinal cancers: People who had sustained overweight or obesity from age 20 years through middle age faced an increased risk of developing those cancers after age 55 years. 

The timing of weight gain didn’t seem to matter either. The same elevated risk held among people who were normal weight in their younger years but became overweight after age 55 years.

Those studies focused on later-onset disease. But, in recent years, experts have tracked a troubling rise in early-onset cancers — those diagnosed before age 50 years — particularly gastrointestinal cancers. 

An obvious question, Dr. Meyerhardt said, is whether the growing prevalence of obesity among young people is partly to blame.

There’s some data to support that, he said. An analysis from the Nurses’ Health Study II found that women with obesity had double the risk for early-onset colorectal cancer as those with a normal BMI. And every 5-kg increase in weight after age 18 years was associated with a 9% increase in colorectal cancer risk.

But while obesity trends probably partly explain the rise in early-onset cancers, there is likely more to the story, Dr. Meyerhardt said.

“I think all of us who see an increasing number of patients under 50 with colorectal cancer know there’s a fair number who do not fit that [high BMI] profile,” he said. “There’s a fair number over 50 who don’t either.”

Does Weight Loss Help?

With all the evidence pointing to high BMI as a cancer risk factor, a logical conclusion is that weight loss should reduce that excess risk. However, Dr. Bea said, there’s actually little data to support that, and what exists comes from observational studies.

Some research has focused on people who had substantial weight loss after bariatric surgery, with encouraging results. A study published in JAMA found that among 5053 people who underwent bariatric surgery, 2.9% developed an obesity-related cancer over 10 years compared with 4.9% in the nonsurgery group.

Most people, however, aim for less dramatic weight loss, with the help of diet and exercise or sometimes medication. Some evidence shows that a modest degree of weight loss may lower the risks for postmenopausal breast and endometrial cancers. 

A 2020 pooled analysis found, for instance, that among women aged ≥ 50 years, those who lost as little as 2.0-4.5 kg, or 4.4-10.0 pounds, and kept it off for 10 years had a lower risk for breast cancer than women whose weight remained stable. And losing more weight — 9 kg, or about 20 pounds, or more — was even better for lowering cancer risk.

But other research suggests the opposite. A recent analysis found that people who lost weight within the past 2 years through diet and exercise had a higher risk for a range of cancers compared with those who did not lose weight. Overall, though, the increased risk was quite low.

Whatever the research does, or doesn’t, show about weight and cancer risk, Dr. Basen-Engquist said, it’s important that risk factors, obesity and otherwise, aren’t “used as blame tools.”

“With obesity, behavior certainly plays into it,” she said. “But there are so many influences on our behavior that are socially determined.”

Both Dr. Basen-Engquist and Dr. Meyerhardt said it’s important for clinicians to consider the individual in front of them and for everyone to set realistic expectations. 

People with obesity should not feel they have to become thin to be healthier, and no one has to leap from being sedentary to exercising several hours a week. 

“We don’t want patients to feel that if they don’t get to a stated goal in a guideline, it’s all for naught,” Dr. Meyerhardt said.

A version of this article appeared on Medscape.com.

According to the Centers for Disease Control and Prevention (CDC), over 684,000 Americans are diagnosed with an “obesity-associated” cancer each year.

The incidence of many of these cancers has been rising in recent years, particularly among younger people — a trend that sits in contrast with the overall decline in cancers with no established relationship to excess weight, such as lung and skin cancers. 

Is obesity the new smoking? Not exactly.

Tracing a direct line between excess fat and cancer is much less clear-cut than it is with tobacco. While about 42% of cancers — including common ones such as colorectal and postmenopausal breast cancers — are considered obesity-related, only about 8% of incident cancers are attributed to excess body weight. People often develop those diseases regardless of weight.

Although plenty of evidence points to excess body fat as a cancer risk factor, it’s unclear at what point excess weight has an effect. Is gaining weight later in life, for instance, better or worse for cancer risk than being overweight or obese from a young age?

There’s another glaring knowledge gap: Does losing weight at some point in adulthood change the picture? In other words, how many of those 684,000 diagnoses might have been prevented if people shed excess pounds?

When it comes to weight and cancer risk, “there’s a lot we don’t know,” said Jennifer W. Bea, PhD, associate professor, health promotion sciences, University of Arizona, Tucson.

A Consistent but Complicated Relationship

Given the growing incidence of obesity — which currently affects about 42% of US adults and 20% of children and teenagers — it’s no surprise that many studies have delved into the potential effects of excess weight on cancer rates.

Although virtually all the evidence comes from large cohort studies, leaving the cause-effect question open, certain associations keep showing up.

“What we know is that, consistently, a higher body mass index [BMI] — particularly in the obese category — leads to a higher risk of multiple cancers,” said Jeffrey A. Meyerhardt, MD, MPH, codirector, Colon and Rectal Cancer Center, Dana-Farber Cancer Institute, Boston.

In a widely cited report published in The New England Journal of Medicine in 2016, the International Agency for Research on Cancer (IARC) analyzed over 1000 epidemiologic studies on body fat and cancer. The agency pointed to over a dozen cancers, including some of the most common and deadly, linked to excess body weight.

That list includes esophageal adenocarcinoma and endometrial cancer — associated with the highest risk — along with kidney, liver, stomach (gastric cardia), pancreatic, colorectal, postmenopausal breast, gallbladder, ovarian, and thyroid cancers, plus multiple myeloma and meningioma. There’s also “limited” evidence linking excess weight to additional cancer types, including aggressive prostate cancer and certain head and neck cancers.

At the same time, Dr. Meyerhardt said, many of those same cancers are also associated with issues that lead to, or coexist with, overweight and obesity, including poor diet, lack of exercise, and metabolic conditions such as diabetes. 

It’s a complicated web, and it’s likely, Dr. Meyerhardt said, that high BMI both directly affects cancer risk and is part of a “causal pathway” of other factors that do.

Regarding direct effects, preclinical research has pointed to multiple ways in which excess body fat could contribute to cancer, said Karen M. Basen-Engquist, PhD, MPH, professor, Division of Cancer Prevention and Population Services, The University of Texas MD Anderson Cancer Center, Houston.

One broad mechanism to help explain the obesity-cancer link is chronic systemic inflammation because excess fat tissue can raise levels of substances in the body, such as tumor necrosis factor alpha and interleukin 6, which fuel inflammation. Excess fat also contributes to hyperinsulinemia — too much insulin in the blood — which can help promote the growth and spread of tumor cells. 

But the underlying reasons also appear to vary by cancer type, Dr. Basen-Engquist said. With hormonally driven cancer types, such as breast and endometrial, excess body fat may alter hormone levels in ways that spur tumor growth. Extra fat tissue may, for example, convert androgens into estrogens, which could help feed estrogen-dependent tumors.

That, Dr. Basen-Engquist noted, could be why excess weight is associated with postmenopausal, not premenopausal, breast cancer: Before menopause, body fat is a relatively minor contributor to estrogen levels but becomes more important after menopause.

How Big Is the Effect?

While more than a dozen cancers have been consistently linked to excess weight, the strength of those associations varies considerably. 

Endometrial and esophageal cancers are two that stand out. In the 2016 IARC analysis, people with severe obesity had a seven-times greater risk for endometrial cancer and 4.8-times greater risk for esophageal adenocarcinoma vs people with a normal BMI.

With other cancers, the risk increases for those with severe obesity compared with a normal BMI were far more modest: 10% for ovarian cancer, 30% for colorectal cancer, and 80% for kidney and stomach cancers, for example. For postmenopausal breast cancer, every five-unit increase in BMI was associated with a 10% relative risk increase.

A 2018 study from the American Cancer Society, which attempted to estimate the proportion of cancers in the United States attributable to modifiable risk factors — including alcohol consumption, ultraviolet rays exposure, and physical inactivity — found that smoking accounted for the highest proportion of cancer cases by a wide margin (19%), but excess weight came in second (7.8%).

Again, weight appeared to play a bigger role in certain cancers than others: An estimated 60% of endometrial cancers were linked to excess weight, as were roughly one third of esophageal, kidney, and liver cancers. At the other end of the spectrum, just over 11% of breast, 5% of colorectal, and 4% of ovarian cancers were attributable to excess weight.

Even at the lower end, those rates could make a big difference on the population level, especially for groups with higher rates of obesity.

CDC data show that obesity-related cancers are rising among women younger than 50 years, most rapidly among Hispanic women, and some less common obesity-related cancers, such as stomach, thyroid and pancreatic, are also rising among Black individuals and Hispanic Americans.

Obesity may be one reason for growing cancer disparities, said Leah Ferrucci, PhD, MPH, assistant professor, epidemiology, Yale School of Public Health, New Haven, Connecticut. But, she added, the evidence is limited because Black individuals and Hispanic Americans are understudied.

When Do Extra Pounds Matter?

When it comes to cancer risk, at what point in life does excess weight, or weight gain, matter? Is the standard weight gain in middle age, for instance, as hazardous as being overweight or obese from a young age?

Some evidence suggests there’s no “safe” time for putting on excess pounds.

A recent meta-analysis concluded that weight gain at any point after age 18 years is associated with incremental increases in the risk for postmenopausal breast cancer. A 2023 study in JAMA Network Open found a similar pattern with colorectal and other gastrointestinal cancers: People who had sustained overweight or obesity from age 20 years through middle age faced an increased risk of developing those cancers after age 55 years. 

The timing of weight gain didn’t seem to matter either. The same elevated risk held among people who were normal weight in their younger years but became overweight after age 55 years.

Those studies focused on later-onset disease. But, in recent years, experts have tracked a troubling rise in early-onset cancers — those diagnosed before age 50 years — particularly gastrointestinal cancers. 

An obvious question, Dr. Meyerhardt said, is whether the growing prevalence of obesity among young people is partly to blame.

There’s some data to support that, he said. An analysis from the Nurses’ Health Study II found that women with obesity had double the risk for early-onset colorectal cancer as those with a normal BMI. And every 5-kg increase in weight after age 18 years was associated with a 9% increase in colorectal cancer risk.

But while obesity trends probably partly explain the rise in early-onset cancers, there is likely more to the story, Dr. Meyerhardt said.

“I think all of us who see an increasing number of patients under 50 with colorectal cancer know there’s a fair number who do not fit that [high BMI] profile,” he said. “There’s a fair number over 50 who don’t either.”

Does Weight Loss Help?

With all the evidence pointing to high BMI as a cancer risk factor, a logical conclusion is that weight loss should reduce that excess risk. However, Dr. Bea said, there’s actually little data to support that, and what exists comes from observational studies.

Some research has focused on people who had substantial weight loss after bariatric surgery, with encouraging results. A study published in JAMA found that among 5053 people who underwent bariatric surgery, 2.9% developed an obesity-related cancer over 10 years compared with 4.9% in the nonsurgery group.

Most people, however, aim for less dramatic weight loss, with the help of diet and exercise or sometimes medication. Some evidence shows that a modest degree of weight loss may lower the risks for postmenopausal breast and endometrial cancers. 

A 2020 pooled analysis found, for instance, that among women aged ≥ 50 years, those who lost as little as 2.0-4.5 kg, or 4.4-10.0 pounds, and kept it off for 10 years had a lower risk for breast cancer than women whose weight remained stable. And losing more weight — 9 kg, or about 20 pounds, or more — was even better for lowering cancer risk.

But other research suggests the opposite. A recent analysis found that people who lost weight within the past 2 years through diet and exercise had a higher risk for a range of cancers compared with those who did not lose weight. Overall, though, the increased risk was quite low.

Whatever the research does, or doesn’t, show about weight and cancer risk, Dr. Basen-Engquist said, it’s important that risk factors, obesity and otherwise, aren’t “used as blame tools.”

“With obesity, behavior certainly plays into it,” she said. “But there are so many influences on our behavior that are socially determined.”

Both Dr. Basen-Engquist and Dr. Meyerhardt said it’s important for clinicians to consider the individual in front of them and for everyone to set realistic expectations. 

People with obesity should not feel they have to become thin to be healthier, and no one has to leap from being sedentary to exercising several hours a week. 

“We don’t want patients to feel that if they don’t get to a stated goal in a guideline, it’s all for naught,” Dr. Meyerhardt said.

A version of this article appeared on Medscape.com.

TOPLINE:

An early serum cortisol concentration of > 237 nmol/L (> 8.6 μg/dL) has been validated as a safe and useful screening test with 100% specificity for predicting recovery of the hypothalamic-pituitary-adrenal (HPA) axis in patients on tapering regimes from long‐term chronic glucocorticoid therapy (CGT).

METHODOLOGY:

• A retrospective review of 250-µg Synacthen test (SST) results performed in patients on tapering CGT doses from a single-center rheumatology department over 12 months.
• A total of 60 SSTs were performed in 58 patients, all in the morning (7-12 AM) after withholding CGT for 48 hours.
• Peripheral blood was sampled for cortisol at baseline, 30 minutes, and 60 minutes.
• Adrenal insufficiency (AI) was defined as a peak serum cortisol concentration.

TAKEAWAY:

• The mean duration of CGT (all prednisolone) was 63 months, prescribed primarily for giant cell arteritis/polymyalgia rheumatica (48%) and inflammatory arthritis (18%), with a mean daily dose of 3.4 mg at the time of SST.
• With the investigators’ previously reported basal serum cortisol concentration of > 237 nmol/L (> 8.6 μg/dL) used to confirm an intact HPA axis, no patient with AI would have been missed, but 37 of 51 (73%) unnecessary SSTs in euadrenal patients would have been avoided.
• A basal serum cortisol concentration of > 227 nmol/L had a specificity of 100% for predicting passing the SST, while a basal serum cortisol concentration of ≤ 55 nmol/L had a 100% sensitivity for predicting failure.
• A mean daily prednisolone dosing at the time of SST in patients with AI was significantly higher than that with normal SSTs (5.7 vs 2.9 mg, respectively; P = .01).

IN PRACTICE:

“This offers a more rapid, convenient, and cost‐effective screening method for patients requiring biochemical assessment of the HPA axis with the potential for significant resource savings without any adverse impact on patient safety,” the authors wrote.

SOURCE:

The study was conducted by Ella Sharma, of the Department of Endocrinology, Royal Victoria Infirmary, Newcastle upon Tyne, UK, and colleagues and published online on May 19, 2024, as a letter in Clinical Endocrinology.

LIMITATIONS:

Not provided.

DISCLOSURES: 

Not provided.
 

A version of this article appeared on Medscape.com.

TOPLINE:

An early serum cortisol concentration of > 237 nmol/L (> 8.6 μg/dL) has been validated as a safe and useful screening test with 100% specificity for predicting recovery of the hypothalamic-pituitary-adrenal (HPA) axis in patients on tapering regimes from long‐term chronic glucocorticoid therapy (CGT).

METHODOLOGY:

• A retrospective review of 250-µg Synacthen test (SST) results performed in patients on tapering CGT doses from a single-center rheumatology department over 12 months.
• A total of 60 SSTs were performed in 58 patients, all in the morning (7-12 AM) after withholding CGT for 48 hours.
• Peripheral blood was sampled for cortisol at baseline, 30 minutes, and 60 minutes.
• Adrenal insufficiency (AI) was defined as a peak serum cortisol concentration.

TAKEAWAY:

• The mean duration of CGT (all prednisolone) was 63 months, prescribed primarily for giant cell arteritis/polymyalgia rheumatica (48%) and inflammatory arthritis (18%), with a mean daily dose of 3.4 mg at the time of SST.
• With the investigators’ previously reported basal serum cortisol concentration of > 237 nmol/L (> 8.6 μg/dL) used to confirm an intact HPA axis, no patient with AI would have been missed, but 37 of 51 (73%) unnecessary SSTs in euadrenal patients would have been avoided.
• A basal serum cortisol concentration of > 227 nmol/L had a specificity of 100% for predicting passing the SST, while a basal serum cortisol concentration of ≤ 55 nmol/L had a 100% sensitivity for predicting failure.
• A mean daily prednisolone dosing at the time of SST in patients with AI was significantly higher than that with normal SSTs (5.7 vs 2.9 mg, respectively; P = .01).

IN PRACTICE:

“This offers a more rapid, convenient, and cost‐effective screening method for patients requiring biochemical assessment of the HPA axis with the potential for significant resource savings without any adverse impact on patient safety,” the authors wrote.

SOURCE:

The study was conducted by Ella Sharma, of the Department of Endocrinology, Royal Victoria Infirmary, Newcastle upon Tyne, UK, and colleagues and published online on May 19, 2024, as a letter in Clinical Endocrinology.

LIMITATIONS:

Not provided.

DISCLOSURES: 

Not provided.
 

A version of this article appeared on Medscape.com.

TOPLINE:

An early serum cortisol concentration of > 237 nmol/L (> 8.6 μg/dL) has been validated as a safe and useful screening test with 100% specificity for predicting recovery of the hypothalamic-pituitary-adrenal (HPA) axis in patients on tapering regimes from long‐term chronic glucocorticoid therapy (CGT).

METHODOLOGY:

• A retrospective review of 250-µg Synacthen test (SST) results performed in patients on tapering CGT doses from a single-center rheumatology department over 12 months.
• A total of 60 SSTs were performed in 58 patients, all in the morning (7-12 AM) after withholding CGT for 48 hours.
• Peripheral blood was sampled for cortisol at baseline, 30 minutes, and 60 minutes.
• Adrenal insufficiency (AI) was defined as a peak serum cortisol concentration.

TAKEAWAY:

• The mean duration of CGT (all prednisolone) was 63 months, prescribed primarily for giant cell arteritis/polymyalgia rheumatica (48%) and inflammatory arthritis (18%), with a mean daily dose of 3.4 mg at the time of SST.
• With the investigators’ previously reported basal serum cortisol concentration of > 237 nmol/L (> 8.6 μg/dL) used to confirm an intact HPA axis, no patient with AI would have been missed, but 37 of 51 (73%) unnecessary SSTs in euadrenal patients would have been avoided.
• A basal serum cortisol concentration of > 227 nmol/L had a specificity of 100% for predicting passing the SST, while a basal serum cortisol concentration of ≤ 55 nmol/L had a 100% sensitivity for predicting failure.
• A mean daily prednisolone dosing at the time of SST in patients with AI was significantly higher than that with normal SSTs (5.7 vs 2.9 mg, respectively; P = .01).

IN PRACTICE:

“This offers a more rapid, convenient, and cost‐effective screening method for patients requiring biochemical assessment of the HPA axis with the potential for significant resource savings without any adverse impact on patient safety,” the authors wrote.

SOURCE:

The study was conducted by Ella Sharma, of the Department of Endocrinology, Royal Victoria Infirmary, Newcastle upon Tyne, UK, and colleagues and published online on May 19, 2024, as a letter in Clinical Endocrinology.

LIMITATIONS:

Not provided.

DISCLOSURES: 

Not provided.
 

A version of this article appeared on Medscape.com.

WASHINGTON — In contrast with a previous study that found glucagon-like peptide 1 (GLP-1) receptor agonists associated with an increased risk for acute pancreatitis and bowel obstruction, a new retrospective study found no significant link to these complications. The new data did, however, reinforce an association between GLP-1s and gastroparesis and biliary disease, specifically gallstones.

One of the big differences from the previous study, published in JAMA in October 2023 by Sodhi and colleagues , is that the current research was able to account for initial body mass index (BMI), said Benjamin Liu, MD, a resident in internal medicine at Case Western Reserve University School of Medicine, Cleveland, Ohio.

This is important, he explained in his presentation (abstract 1074) at the annual Digestive Disease Week^® 2024, because obesity on its own is associated with an increased risk for some of these gastrointestinal (GI) outcomes.

“They did an excellent study,” Dr. Liu said. “But their platform did not allow them to match participants for BMI.”

Another distinction between the two studies is that the JAMA study excluded people who had diabetes 90 days before or 30 days following the start of GLP-1 therapy.

Instead, Dr. Liu said, he and colleague Gengqing Song, MD, “just made it simple” and excluded anyone with diabetes or an A1c ≥ 6.5.

We didn’t want participants with diabetes because “we were looking at GLP-1s for weight loss,” Dr. Liu explained.

Although some clinical trials have already assessed adverse events of these medications, “clinical trials are not always a perfect representation of the real world,” Dr. Liu said in an interview. “So, it’s important to do real-world studies to see just what actually goes on.”
 

Reassessing GI Complications 

In the current study, the researchers identified 105,793 patients from the TriNetX healthcare database taking a GLP-1, either semaglutide or liraglutide, for weight loss and 8794 patients taking 8 mg naltrexone/90 mg bupropion. After propensity matching, including for BMI, there were 8792 patients in each group.

They were identified in the database between 2011 and 2023. Researchers noted their first-ever occurrence of acute pancreatitis, bowel obstruction, gastroparesis, or biliary disease during the study period.

Participants had a BMI ≥ 30 kg/m². In addition to BMI, propensity score matching included demographics, alcohol use, smoking, hyperlipidemia, and abdominal surgery. A second analysis specifically did not match participants for BMI.

The researchers found no significant association between GLP-1s and acute pancreatitis (adjusted hazard ratio [HR], 1.19; 95% CI, 0.66-2.14).

The labeling for semaglutide and liraglutide warns about an increased risk for acute pancreatitis, “but real-world studies and clinical trials are increasingly suggesting there is no increased risk,” Dr. Liu said.

They also did not find a significant association between GLP-1s and bowel obstruction (HR, 1.30; 95% CI, 0.69-2.18).

Despite the current findings, more research — especially prospective data — is needed to confirm pancreatitis as well as other GI risks like bowel obstruction potentially associated with GLP-1s, he added.

The study did, however, find an elevated risk for biliary disease (HR, 1.27; 95% CI, 1.02-1.59) in the BMI-matched cohorts.

This could be due to the rapidity of weight loss, Dr. Liu suggested. “We found that semaglutide caused more weight loss at 6 and 12 months than naltrexone/bupropion, and it did so at a faster rate. That falls in line with other data that suggest if you lose weight too fast, you actually have an increased risk of gallstones,” he said.

Rapid weight loss can release cholesterol into the body, which then collects in the bile ducts and causes gallstones. This risk for gallstone formation with rapid weight loss is also seen after bariatric surgery, Dr. Liu said.

Without BMI matching, he noted, the increased risk for biliary disease was no longer significant (HR, 1.21; 95% CI, 0.96-1.52).

The researchers also reported a significant association between GLP-1s and gastroparesis (HR, 2.30; 95% CI, 1.19-4.46), confirming the results of the JAMA study “but at a much lower incidence rate once we excluded all patients with diabetes,” said Dr. Liu. The JAMA study had a HR of 3.67 for gastroparesis (95% CI, 1.15-11.90).
 

Weighing in on the Results

“Overall, their study design looks sound,” said Mahyar Etminan, PharmD, associate professor of medicine at the University of British Columbia in Vancouver and an author of the JAMA study. He agreed that Dr. Liu’s research confirmed their findings about gastroparesis and biliary disease.

However, “I interpret the results with intestinal obstruction and pancreatitis as more inconclusive than no risk,” he added.

Session co-moderator and gastroenterologist and motility specialist with Stanford Health Care in California, Linda Anh Bui Nguyen, MD, AGAF, said that she thinks “it’s a promising study.

“But with any retrospective study where you’re looking at ICD-10 [International Classification of Diseases, Tenth Revision] codes, it really depends on the coders. The code could be subjective and could be wrong,” said Dr. Nguyen, clinical professor of medicine at Stanford Medical School, California.

For example, the diagnosis of gastroparesis requires a normal endoscopy and a gastric emptying test. “But we find that, frequently, patients are being given a diagnosis of gastroparesis without the test,” she said.

An unanswered question also remains regarding how pancreatitis or biliary disease is being diagnosed: “Was it imaging, lab testing, or symptoms?” she said in an interview. “For example, if patients had pain on the right side, did they call it biliary?”

Dr. Nguyen added that it is difficult to get this kind of detail in retrospective studies. She also agreed with Dr. Liu that prospective studies are warranted.

The study was independently supported. Dr. Liu, Dr. Etminan, and Dr. Nguyen had no relevant financial disclosures.

A version of this article appeared on Medscape.com.

WASHINGTON — In contrast with a previous study that found glucagon-like peptide 1 (GLP-1) receptor agonists associated with an increased risk for acute pancreatitis and bowel obstruction, a new retrospective study found no significant link to these complications. The new data did, however, reinforce an association between GLP-1s and gastroparesis and biliary disease, specifically gallstones.

One of the big differences from the previous study, published in JAMA in October 2023 by Sodhi and colleagues , is that the current research was able to account for initial body mass index (BMI), said Benjamin Liu, MD, a resident in internal medicine at Case Western Reserve University School of Medicine, Cleveland, Ohio.

This is important, he explained in his presentation (abstract 1074) at the annual Digestive Disease Week^® 2024, because obesity on its own is associated with an increased risk for some of these gastrointestinal (GI) outcomes.

“They did an excellent study,” Dr. Liu said. “But their platform did not allow them to match participants for BMI.”

Another distinction between the two studies is that the JAMA study excluded people who had diabetes 90 days before or 30 days following the start of GLP-1 therapy.

Instead, Dr. Liu said, he and colleague Gengqing Song, MD, “just made it simple” and excluded anyone with diabetes or an A1c ≥ 6.5.

We didn’t want participants with diabetes because “we were looking at GLP-1s for weight loss,” Dr. Liu explained.

Although some clinical trials have already assessed adverse events of these medications, “clinical trials are not always a perfect representation of the real world,” Dr. Liu said in an interview. “So, it’s important to do real-world studies to see just what actually goes on.”
 

Reassessing GI Complications 

In the current study, the researchers identified 105,793 patients from the TriNetX healthcare database taking a GLP-1, either semaglutide or liraglutide, for weight loss and 8794 patients taking 8 mg naltrexone/90 mg bupropion. After propensity matching, including for BMI, there were 8792 patients in each group.

They were identified in the database between 2011 and 2023. Researchers noted their first-ever occurrence of acute pancreatitis, bowel obstruction, gastroparesis, or biliary disease during the study period.

Participants had a BMI ≥ 30 kg/m². In addition to BMI, propensity score matching included demographics, alcohol use, smoking, hyperlipidemia, and abdominal surgery. A second analysis specifically did not match participants for BMI.

The researchers found no significant association between GLP-1s and acute pancreatitis (adjusted hazard ratio [HR], 1.19; 95% CI, 0.66-2.14).

The labeling for semaglutide and liraglutide warns about an increased risk for acute pancreatitis, “but real-world studies and clinical trials are increasingly suggesting there is no increased risk,” Dr. Liu said.

They also did not find a significant association between GLP-1s and bowel obstruction (HR, 1.30; 95% CI, 0.69-2.18).

Despite the current findings, more research — especially prospective data — is needed to confirm pancreatitis as well as other GI risks like bowel obstruction potentially associated with GLP-1s, he added.

The study did, however, find an elevated risk for biliary disease (HR, 1.27; 95% CI, 1.02-1.59) in the BMI-matched cohorts.

This could be due to the rapidity of weight loss, Dr. Liu suggested. “We found that semaglutide caused more weight loss at 6 and 12 months than naltrexone/bupropion, and it did so at a faster rate. That falls in line with other data that suggest if you lose weight too fast, you actually have an increased risk of gallstones,” he said.

Rapid weight loss can release cholesterol into the body, which then collects in the bile ducts and causes gallstones. This risk for gallstone formation with rapid weight loss is also seen after bariatric surgery, Dr. Liu said.

Without BMI matching, he noted, the increased risk for biliary disease was no longer significant (HR, 1.21; 95% CI, 0.96-1.52).

The researchers also reported a significant association between GLP-1s and gastroparesis (HR, 2.30; 95% CI, 1.19-4.46), confirming the results of the JAMA study “but at a much lower incidence rate once we excluded all patients with diabetes,” said Dr. Liu. The JAMA study had a HR of 3.67 for gastroparesis (95% CI, 1.15-11.90).
 

Weighing in on the Results

“Overall, their study design looks sound,” said Mahyar Etminan, PharmD, associate professor of medicine at the University of British Columbia in Vancouver and an author of the JAMA study. He agreed that Dr. Liu’s research confirmed their findings about gastroparesis and biliary disease.

However, “I interpret the results with intestinal obstruction and pancreatitis as more inconclusive than no risk,” he added.

Session co-moderator and gastroenterologist and motility specialist with Stanford Health Care in California, Linda Anh Bui Nguyen, MD, AGAF, said that she thinks “it’s a promising study.

“But with any retrospective study where you’re looking at ICD-10 [International Classification of Diseases, Tenth Revision] codes, it really depends on the coders. The code could be subjective and could be wrong,” said Dr. Nguyen, clinical professor of medicine at Stanford Medical School, California.

For example, the diagnosis of gastroparesis requires a normal endoscopy and a gastric emptying test. “But we find that, frequently, patients are being given a diagnosis of gastroparesis without the test,” she said.

An unanswered question also remains regarding how pancreatitis or biliary disease is being diagnosed: “Was it imaging, lab testing, or symptoms?” she said in an interview. “For example, if patients had pain on the right side, did they call it biliary?”

Dr. Nguyen added that it is difficult to get this kind of detail in retrospective studies. She also agreed with Dr. Liu that prospective studies are warranted.

The study was independently supported. Dr. Liu, Dr. Etminan, and Dr. Nguyen had no relevant financial disclosures.

A version of this article appeared on Medscape.com.

WASHINGTON — In contrast with a previous study that found glucagon-like peptide 1 (GLP-1) receptor agonists associated with an increased risk for acute pancreatitis and bowel obstruction, a new retrospective study found no significant link to these complications. The new data did, however, reinforce an association between GLP-1s and gastroparesis and biliary disease, specifically gallstones.

One of the big differences from the previous study, published in JAMA in October 2023 by Sodhi and colleagues , is that the current research was able to account for initial body mass index (BMI), said Benjamin Liu, MD, a resident in internal medicine at Case Western Reserve University School of Medicine, Cleveland, Ohio.

This is important, he explained in his presentation (abstract 1074) at the annual Digestive Disease Week^® 2024, because obesity on its own is associated with an increased risk for some of these gastrointestinal (GI) outcomes.

“They did an excellent study,” Dr. Liu said. “But their platform did not allow them to match participants for BMI.”

Another distinction between the two studies is that the JAMA study excluded people who had diabetes 90 days before or 30 days following the start of GLP-1 therapy.

Instead, Dr. Liu said, he and colleague Gengqing Song, MD, “just made it simple” and excluded anyone with diabetes or an A1c ≥ 6.5.

We didn’t want participants with diabetes because “we were looking at GLP-1s for weight loss,” Dr. Liu explained.

Although some clinical trials have already assessed adverse events of these medications, “clinical trials are not always a perfect representation of the real world,” Dr. Liu said in an interview. “So, it’s important to do real-world studies to see just what actually goes on.”
 

Reassessing GI Complications 

In the current study, the researchers identified 105,793 patients from the TriNetX healthcare database taking a GLP-1, either semaglutide or liraglutide, for weight loss and 8794 patients taking 8 mg naltrexone/90 mg bupropion. After propensity matching, including for BMI, there were 8792 patients in each group.

They were identified in the database between 2011 and 2023. Researchers noted their first-ever occurrence of acute pancreatitis, bowel obstruction, gastroparesis, or biliary disease during the study period.

Participants had a BMI ≥ 30 kg/m². In addition to BMI, propensity score matching included demographics, alcohol use, smoking, hyperlipidemia, and abdominal surgery. A second analysis specifically did not match participants for BMI.

The researchers found no significant association between GLP-1s and acute pancreatitis (adjusted hazard ratio [HR], 1.19; 95% CI, 0.66-2.14).

The labeling for semaglutide and liraglutide warns about an increased risk for acute pancreatitis, “but real-world studies and clinical trials are increasingly suggesting there is no increased risk,” Dr. Liu said.

They also did not find a significant association between GLP-1s and bowel obstruction (HR, 1.30; 95% CI, 0.69-2.18).

Despite the current findings, more research — especially prospective data — is needed to confirm pancreatitis as well as other GI risks like bowel obstruction potentially associated with GLP-1s, he added.

The study did, however, find an elevated risk for biliary disease (HR, 1.27; 95% CI, 1.02-1.59) in the BMI-matched cohorts.

This could be due to the rapidity of weight loss, Dr. Liu suggested. “We found that semaglutide caused more weight loss at 6 and 12 months than naltrexone/bupropion, and it did so at a faster rate. That falls in line with other data that suggest if you lose weight too fast, you actually have an increased risk of gallstones,” he said.

Rapid weight loss can release cholesterol into the body, which then collects in the bile ducts and causes gallstones. This risk for gallstone formation with rapid weight loss is also seen after bariatric surgery, Dr. Liu said.

Without BMI matching, he noted, the increased risk for biliary disease was no longer significant (HR, 1.21; 95% CI, 0.96-1.52).

The researchers also reported a significant association between GLP-1s and gastroparesis (HR, 2.30; 95% CI, 1.19-4.46), confirming the results of the JAMA study “but at a much lower incidence rate once we excluded all patients with diabetes,” said Dr. Liu. The JAMA study had a HR of 3.67 for gastroparesis (95% CI, 1.15-11.90).
 

Weighing in on the Results

“Overall, their study design looks sound,” said Mahyar Etminan, PharmD, associate professor of medicine at the University of British Columbia in Vancouver and an author of the JAMA study. He agreed that Dr. Liu’s research confirmed their findings about gastroparesis and biliary disease.

However, “I interpret the results with intestinal obstruction and pancreatitis as more inconclusive than no risk,” he added.

Session co-moderator and gastroenterologist and motility specialist with Stanford Health Care in California, Linda Anh Bui Nguyen, MD, AGAF, said that she thinks “it’s a promising study.

“But with any retrospective study where you’re looking at ICD-10 [International Classification of Diseases, Tenth Revision] codes, it really depends on the coders. The code could be subjective and could be wrong,” said Dr. Nguyen, clinical professor of medicine at Stanford Medical School, California.

For example, the diagnosis of gastroparesis requires a normal endoscopy and a gastric emptying test. “But we find that, frequently, patients are being given a diagnosis of gastroparesis without the test,” she said.

An unanswered question also remains regarding how pancreatitis or biliary disease is being diagnosed: “Was it imaging, lab testing, or symptoms?” she said in an interview. “For example, if patients had pain on the right side, did they call it biliary?”

Dr. Nguyen added that it is difficult to get this kind of detail in retrospective studies. She also agreed with Dr. Liu that prospective studies are warranted.

The study was independently supported. Dr. Liu, Dr. Etminan, and Dr. Nguyen had no relevant financial disclosures.

A version of this article appeared on Medscape.com.

TOPLINE:

A commercially available test for 40 genetic variants that identifies people with the “hungry gut” obesity phenotype can predict who will respond most to semaglutide for weight management, new evidence reveals.

METHODOLOGY:

• A machine learning genetic risk score can identify people with the hungry gut obesity phenotype, which has been found to be associated with greater weight loss with the glucagon-like peptide 1 receptor agonists (GLP-1 RA) liraglutide and exenatide. 
• For this study, researchers calculated the genetic risk score for 84 adults undergoing weight loss interventions at Mayo Clinic who were prescribed the GLP-1 RA semaglutide.
• Study participants were classified as the obesity phenotype hungry gut positive (n = 51) or hungry gut negative (n = 33).
• The researchers measured total body weight loss at 3, 6, 9, and 12 months and assessed the ability of the score to predict the response to semaglutide (defined as ≥ 5% of total body weight loss measured at 12 months).

TAKEAWAY:

• At 3 and 6 months, there were no significant differences in weight loss between the hungry gut positive and hungry gut negative groups.
• By 9 months, participants in the positive group lost 14.4% of their total body weight compared with 10.3% in case of participants in the negative group (P = .045).
• After a total of 12 months, the positive group lost 19.5% of their total body weight compared with 10.0% in case of participants in the negative group (P = .01).
• When used to predict the response to semaglutide, the area under the curve for the machine-learning genetic risk score was 0.76 (95% CI, 0.57-0.94; P = .04).

IN PRACTICE:

We can now tell with confidence who is going to respond to semaglutide, said Andres Acosta, MD, PhD, associate professor of medicine at Mayo Clinic. “For nonresponders, we can think about other interventions or medications that we have available.”

SOURCE:

This study was presented on May 20, 2024, at the annual Digestive Disease Week® (DDW) (Abstract 638).

LIMITATIONS:

Further prospective studies are needed to assess the validity of the test in a more diverse population and with different weight loss interventions.

DISCLOSURES:

This study was supported by a partnership between Mayo Clinic and Phenomix Sciences. Dr. Acosta is a cofounder of Phenomix Sciences.

A version of this article appeared on Medscape.com.

TOPLINE:

A commercially available test for 40 genetic variants that identifies people with the “hungry gut” obesity phenotype can predict who will respond most to semaglutide for weight management, new evidence reveals.

METHODOLOGY:

• A machine learning genetic risk score can identify people with the hungry gut obesity phenotype, which has been found to be associated with greater weight loss with the glucagon-like peptide 1 receptor agonists (GLP-1 RA) liraglutide and exenatide. 
• For this study, researchers calculated the genetic risk score for 84 adults undergoing weight loss interventions at Mayo Clinic who were prescribed the GLP-1 RA semaglutide.
• Study participants were classified as the obesity phenotype hungry gut positive (n = 51) or hungry gut negative (n = 33).
• The researchers measured total body weight loss at 3, 6, 9, and 12 months and assessed the ability of the score to predict the response to semaglutide (defined as ≥ 5% of total body weight loss measured at 12 months).

TAKEAWAY:

• At 3 and 6 months, there were no significant differences in weight loss between the hungry gut positive and hungry gut negative groups.
• By 9 months, participants in the positive group lost 14.4% of their total body weight compared with 10.3% in case of participants in the negative group (P = .045).
• After a total of 12 months, the positive group lost 19.5% of their total body weight compared with 10.0% in case of participants in the negative group (P = .01).
• When used to predict the response to semaglutide, the area under the curve for the machine-learning genetic risk score was 0.76 (95% CI, 0.57-0.94; P = .04).

IN PRACTICE:

We can now tell with confidence who is going to respond to semaglutide, said Andres Acosta, MD, PhD, associate professor of medicine at Mayo Clinic. “For nonresponders, we can think about other interventions or medications that we have available.”

SOURCE:

This study was presented on May 20, 2024, at the annual Digestive Disease Week® (DDW) (Abstract 638).

LIMITATIONS:

Further prospective studies are needed to assess the validity of the test in a more diverse population and with different weight loss interventions.

DISCLOSURES:

This study was supported by a partnership between Mayo Clinic and Phenomix Sciences. Dr. Acosta is a cofounder of Phenomix Sciences.

A version of this article appeared on Medscape.com.

TOPLINE:

A commercially available test for 40 genetic variants that identifies people with the “hungry gut” obesity phenotype can predict who will respond most to semaglutide for weight management, new evidence reveals.

METHODOLOGY:

• A machine learning genetic risk score can identify people with the hungry gut obesity phenotype, which has been found to be associated with greater weight loss with the glucagon-like peptide 1 receptor agonists (GLP-1 RA) liraglutide and exenatide. 
• For this study, researchers calculated the genetic risk score for 84 adults undergoing weight loss interventions at Mayo Clinic who were prescribed the GLP-1 RA semaglutide.
• Study participants were classified as the obesity phenotype hungry gut positive (n = 51) or hungry gut negative (n = 33).
• The researchers measured total body weight loss at 3, 6, 9, and 12 months and assessed the ability of the score to predict the response to semaglutide (defined as ≥ 5% of total body weight loss measured at 12 months).

TAKEAWAY:

• At 3 and 6 months, there were no significant differences in weight loss between the hungry gut positive and hungry gut negative groups.
• By 9 months, participants in the positive group lost 14.4% of their total body weight compared with 10.3% in case of participants in the negative group (P = .045).
• After a total of 12 months, the positive group lost 19.5% of their total body weight compared with 10.0% in case of participants in the negative group (P = .01).
• When used to predict the response to semaglutide, the area under the curve for the machine-learning genetic risk score was 0.76 (95% CI, 0.57-0.94; P = .04).

IN PRACTICE:

We can now tell with confidence who is going to respond to semaglutide, said Andres Acosta, MD, PhD, associate professor of medicine at Mayo Clinic. “For nonresponders, we can think about other interventions or medications that we have available.”

SOURCE:

This study was presented on May 20, 2024, at the annual Digestive Disease Week® (DDW) (Abstract 638).

LIMITATIONS:

Further prospective studies are needed to assess the validity of the test in a more diverse population and with different weight loss interventions.

DISCLOSURES:

This study was supported by a partnership between Mayo Clinic and Phenomix Sciences. Dr. Acosta is a cofounder of Phenomix Sciences.

A version of this article appeared on Medscape.com.

The annual production of plastic worldwide has increased exponentially from about 2 million tons in 1950 to 460 million tons in 2019, and current levels are expected to triple by 2060.

Plastic contains more than 10,000 chemicals, including carcinogenic substances and endocrine disruptors. Plastic and associated chemicals are responsible for widespread pollution, contaminating aquatic (marine and freshwater), terrestrial, and atmospheric environments globally.

Atmospheric concentrations of plastic particles are on the rise, to the extent that in a remote station in the Eastern Alps in Austria, the contribution of micro- and nanoplastics (MNPs) to organic matter was comparable to data collected at an urban site.

The ocean is the ultimate destination for much of the plastic. All oceans, on the surface and in the depths, contain plastic, which is even found in polar sea ice. Many plastics seem to resist decomposition in the ocean and could persist in the environment for decades. Macro- and microplastic (MP) particles have been identified in hundreds of marine species, including species consumed by humans.

The quantity and fate of MP particles (> 10 µm) and smaller nanoplastics (< 10 µm) in aquatic environments are poorly understood, but what is most concerning is their ability to cross biologic barriers and the potential harm associated with their mobility in biologic systems.
 

MNP Exposure

MNPs can originate from a wide variety of sources, including food, beverages, and food product packaging. Water bottles represent a significant source of ingestible MNPs for people in their daily lives. Recent estimates, using stimulated Raman scattering imaging, documented a concentration of MNP of approximately 2.4 ± 1.3 × 10⁵ particles per liter of bottled water. Around 90% are nanoplastics, which is two to three orders of magnitude higher than previously reported results for larger MPs.

MNPs enter the body primarily through ingestion or inhalation. For example, MNPs can be ingested by drinking liquids or eating food that has been stored or heated in plastic containers from which they have leaked or by using toothpaste that contains them. Infants are exposed to MPs from artificial milk preparation in polypropylene baby bottles, with higher levels than previously detected and ranging from 14,600 to 4,550,000 particles per capita per day.
 

MNP and Biologic Systems

The possible formation of hetero-aggregates between nanoplastics and natural organic matter has long been recognized as a potential challenge in the analysis of nanoplastics and can influence toxicologic results in biologic exposure. The direct visualization of such hetero-aggregates in real-world samples supports these concerns, but the analysis of MNPs with traditional techniques remains challenging. Unlike engineered nanoparticles (prepared in the laboratory as model systems), the nanoplastics in the environment are label-free and exhibit significant heterogeneity in chemical composition and morphology.

A systematic analysis of evidence on the toxic effects of MNPs on murine models, however, showed that 52.78% of biologic endpoints (related to glucose metabolism, reproduction, oxidative stress, and lipid metabolism) were significantly affected by MNP exposure.
 

Between Risk and Toxicity

MNP can enter the body in vivo through the digestive tract, respiratory tract, and skin contact. On average, humans could ingest from 0.1 to 5 g of MNP per week through various exposure routes.

MNPs are a potential risk factor for cardiovascular diseases, as suggested by a recent study on 257 patients with carotid atheromatous plaques. In 58.4% of cases, polyvinyl chloride was detected in the carotid artery plaque, with an average level of 5.2 ± 2.4 μg/mg of plaque. Patients with MNPs inside the atheroma had a higher risk (relative risk, 4.53) for a composite cardiovascular event of myocardial infarction, stroke, or death from any cause at 34 months of follow-up than participants where MNPs were not detectable inside the atheromatous plaque.

The potential link between inflammatory bowel disease (IBD) and MPs has been hypothesized by a study that reported a higher fecal MP concentration in patients with IBD than in healthy individuals. Fecal MP level was correlated with disease severity.

However, these studies have not demonstrated a causal relationship between MNPs and disease, and the way MNPs may influence cellular functions and induce stress responses is not yet well understood.
 

Future Scenarios

Current evidence confirms the fragmentation of plastic beyond the micrometer level and has unequivocally detected nanoplastics in real samples. As with many other particle distributions of the same size in the natural world, there are substantially more nanoplastics, despite their invisibility with conventional imaging techniques, than particles larger than the micron size.

The initial results of studies on MNPs in humans will stimulate future research on the amounts of MNPs that accumulate in tissue over a person’s lifetime. Researchers also will examine how the particles’ characteristics, including their chemical composition, size, and shape, can influence organs and tissues.

The way MNPs can cause harm, including through effects on the immune system and microbiome, will need to be clarified by investigating possible direct cytotoxic effects, consistent with the introductory statement of the Organization for Economic Cooperation and Development global policy forum on plastics, which states, “Plastic pollution is one of the great environmental challenges of the 21st century, causing wide-ranging damage to ecosystems and human health.”

This story was translated from Univadis Italy, which is part of the Medscape professional network, using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article appeared on Medscape.com.

The annual production of plastic worldwide has increased exponentially from about 2 million tons in 1950 to 460 million tons in 2019, and current levels are expected to triple by 2060.

Plastic contains more than 10,000 chemicals, including carcinogenic substances and endocrine disruptors. Plastic and associated chemicals are responsible for widespread pollution, contaminating aquatic (marine and freshwater), terrestrial, and atmospheric environments globally.

Atmospheric concentrations of plastic particles are on the rise, to the extent that in a remote station in the Eastern Alps in Austria, the contribution of micro- and nanoplastics (MNPs) to organic matter was comparable to data collected at an urban site.

The ocean is the ultimate destination for much of the plastic. All oceans, on the surface and in the depths, contain plastic, which is even found in polar sea ice. Many plastics seem to resist decomposition in the ocean and could persist in the environment for decades. Macro- and microplastic (MP) particles have been identified in hundreds of marine species, including species consumed by humans.

The quantity and fate of MP particles (> 10 µm) and smaller nanoplastics (< 10 µm) in aquatic environments are poorly understood, but what is most concerning is their ability to cross biologic barriers and the potential harm associated with their mobility in biologic systems.
 

MNP Exposure

MNPs can originate from a wide variety of sources, including food, beverages, and food product packaging. Water bottles represent a significant source of ingestible MNPs for people in their daily lives. Recent estimates, using stimulated Raman scattering imaging, documented a concentration of MNP of approximately 2.4 ± 1.3 × 10⁵ particles per liter of bottled water. Around 90% are nanoplastics, which is two to three orders of magnitude higher than previously reported results for larger MPs.

MNPs enter the body primarily through ingestion or inhalation. For example, MNPs can be ingested by drinking liquids or eating food that has been stored or heated in plastic containers from which they have leaked or by using toothpaste that contains them. Infants are exposed to MPs from artificial milk preparation in polypropylene baby bottles, with higher levels than previously detected and ranging from 14,600 to 4,550,000 particles per capita per day.
 

MNP and Biologic Systems

The possible formation of hetero-aggregates between nanoplastics and natural organic matter has long been recognized as a potential challenge in the analysis of nanoplastics and can influence toxicologic results in biologic exposure. The direct visualization of such hetero-aggregates in real-world samples supports these concerns, but the analysis of MNPs with traditional techniques remains challenging. Unlike engineered nanoparticles (prepared in the laboratory as model systems), the nanoplastics in the environment are label-free and exhibit significant heterogeneity in chemical composition and morphology.

A systematic analysis of evidence on the toxic effects of MNPs on murine models, however, showed that 52.78% of biologic endpoints (related to glucose metabolism, reproduction, oxidative stress, and lipid metabolism) were significantly affected by MNP exposure.
 

Between Risk and Toxicity

MNP can enter the body in vivo through the digestive tract, respiratory tract, and skin contact. On average, humans could ingest from 0.1 to 5 g of MNP per week through various exposure routes.

MNPs are a potential risk factor for cardiovascular diseases, as suggested by a recent study on 257 patients with carotid atheromatous plaques. In 58.4% of cases, polyvinyl chloride was detected in the carotid artery plaque, with an average level of 5.2 ± 2.4 μg/mg of plaque. Patients with MNPs inside the atheroma had a higher risk (relative risk, 4.53) for a composite cardiovascular event of myocardial infarction, stroke, or death from any cause at 34 months of follow-up than participants where MNPs were not detectable inside the atheromatous plaque.

The potential link between inflammatory bowel disease (IBD) and MPs has been hypothesized by a study that reported a higher fecal MP concentration in patients with IBD than in healthy individuals. Fecal MP level was correlated with disease severity.

However, these studies have not demonstrated a causal relationship between MNPs and disease, and the way MNPs may influence cellular functions and induce stress responses is not yet well understood.
 

Future Scenarios

Current evidence confirms the fragmentation of plastic beyond the micrometer level and has unequivocally detected nanoplastics in real samples. As with many other particle distributions of the same size in the natural world, there are substantially more nanoplastics, despite their invisibility with conventional imaging techniques, than particles larger than the micron size.

The initial results of studies on MNPs in humans will stimulate future research on the amounts of MNPs that accumulate in tissue over a person’s lifetime. Researchers also will examine how the particles’ characteristics, including their chemical composition, size, and shape, can influence organs and tissues.

The way MNPs can cause harm, including through effects on the immune system and microbiome, will need to be clarified by investigating possible direct cytotoxic effects, consistent with the introductory statement of the Organization for Economic Cooperation and Development global policy forum on plastics, which states, “Plastic pollution is one of the great environmental challenges of the 21st century, causing wide-ranging damage to ecosystems and human health.”

This story was translated from Univadis Italy, which is part of the Medscape professional network, using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article appeared on Medscape.com.

The annual production of plastic worldwide has increased exponentially from about 2 million tons in 1950 to 460 million tons in 2019, and current levels are expected to triple by 2060.

Plastic contains more than 10,000 chemicals, including carcinogenic substances and endocrine disruptors. Plastic and associated chemicals are responsible for widespread pollution, contaminating aquatic (marine and freshwater), terrestrial, and atmospheric environments globally.

Atmospheric concentrations of plastic particles are on the rise, to the extent that in a remote station in the Eastern Alps in Austria, the contribution of micro- and nanoplastics (MNPs) to organic matter was comparable to data collected at an urban site.

The ocean is the ultimate destination for much of the plastic. All oceans, on the surface and in the depths, contain plastic, which is even found in polar sea ice. Many plastics seem to resist decomposition in the ocean and could persist in the environment for decades. Macro- and microplastic (MP) particles have been identified in hundreds of marine species, including species consumed by humans.

The quantity and fate of MP particles (> 10 µm) and smaller nanoplastics (< 10 µm) in aquatic environments are poorly understood, but what is most concerning is their ability to cross biologic barriers and the potential harm associated with their mobility in biologic systems.
 

MNP Exposure

MNPs can originate from a wide variety of sources, including food, beverages, and food product packaging. Water bottles represent a significant source of ingestible MNPs for people in their daily lives. Recent estimates, using stimulated Raman scattering imaging, documented a concentration of MNP of approximately 2.4 ± 1.3 × 10⁵ particles per liter of bottled water. Around 90% are nanoplastics, which is two to three orders of magnitude higher than previously reported results for larger MPs.

MNPs enter the body primarily through ingestion or inhalation. For example, MNPs can be ingested by drinking liquids or eating food that has been stored or heated in plastic containers from which they have leaked or by using toothpaste that contains them. Infants are exposed to MPs from artificial milk preparation in polypropylene baby bottles, with higher levels than previously detected and ranging from 14,600 to 4,550,000 particles per capita per day.
 

MNP and Biologic Systems

The possible formation of hetero-aggregates between nanoplastics and natural organic matter has long been recognized as a potential challenge in the analysis of nanoplastics and can influence toxicologic results in biologic exposure. The direct visualization of such hetero-aggregates in real-world samples supports these concerns, but the analysis of MNPs with traditional techniques remains challenging. Unlike engineered nanoparticles (prepared in the laboratory as model systems), the nanoplastics in the environment are label-free and exhibit significant heterogeneity in chemical composition and morphology.

A systematic analysis of evidence on the toxic effects of MNPs on murine models, however, showed that 52.78% of biologic endpoints (related to glucose metabolism, reproduction, oxidative stress, and lipid metabolism) were significantly affected by MNP exposure.
 

Between Risk and Toxicity

MNP can enter the body in vivo through the digestive tract, respiratory tract, and skin contact. On average, humans could ingest from 0.1 to 5 g of MNP per week through various exposure routes.

MNPs are a potential risk factor for cardiovascular diseases, as suggested by a recent study on 257 patients with carotid atheromatous plaques. In 58.4% of cases, polyvinyl chloride was detected in the carotid artery plaque, with an average level of 5.2 ± 2.4 μg/mg of plaque. Patients with MNPs inside the atheroma had a higher risk (relative risk, 4.53) for a composite cardiovascular event of myocardial infarction, stroke, or death from any cause at 34 months of follow-up than participants where MNPs were not detectable inside the atheromatous plaque.

The potential link between inflammatory bowel disease (IBD) and MPs has been hypothesized by a study that reported a higher fecal MP concentration in patients with IBD than in healthy individuals. Fecal MP level was correlated with disease severity.

However, these studies have not demonstrated a causal relationship between MNPs and disease, and the way MNPs may influence cellular functions and induce stress responses is not yet well understood.
 

Future Scenarios

Current evidence confirms the fragmentation of plastic beyond the micrometer level and has unequivocally detected nanoplastics in real samples. As with many other particle distributions of the same size in the natural world, there are substantially more nanoplastics, despite their invisibility with conventional imaging techniques, than particles larger than the micron size.

The initial results of studies on MNPs in humans will stimulate future research on the amounts of MNPs that accumulate in tissue over a person’s lifetime. Researchers also will examine how the particles’ characteristics, including their chemical composition, size, and shape, can influence organs and tissues.

The way MNPs can cause harm, including through effects on the immune system and microbiome, will need to be clarified by investigating possible direct cytotoxic effects, consistent with the introductory statement of the Organization for Economic Cooperation and Development global policy forum on plastics, which states, “Plastic pollution is one of the great environmental challenges of the 21st century, causing wide-ranging damage to ecosystems and human health.”

This story was translated from Univadis Italy, which is part of the Medscape professional network, using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article appeared on Medscape.com.

TOPLINE: 

Individuals with overweight and obesity who reach a weight-loss plateau at around 6 months on a healthy weight-loss diet may not achieve further weight reduction after switching to a different weight-loss diet.

METHODOLOGY:

• Dietary and lifestyle interventions initially result in rapid weight loss, followed by a weight-loss plateau after a few months and weight regain within a year or two, and diet fatigue has been proposed as a cause but not studied.
• This secondary analysis of a randomized trial assessed weight-loss trajectories before and after switching from a healthy low-carbohydrate (LC) diet to a healthy low-fat (LF) diet (or vice versa) in individuals with overweight and obesity.
• Overall, 42 participants (mean age, 42 years; 64% women; 87% White individuals) recruited from a local community in Palo Alto, California, were assigned to the LF or LC diet for the first 6 months, after which they were switched to the other diet for the remaining 6 months.
• Data from the DIETFITS trial, wherein participants remained either on the LF or LC diet for 12 months, were used as historical control.

The primary outcome was percent weight change at 3-6 months vs that observed at 6-9 months.

TAKEAWAY:

• The combined average weight loss was 7% (95% CI, 8%-6%) during the first 3 months, declining to 2% (95% CI, 3%-1%) between 3 and 6 months. On switching diets, the weight loss further slowed to 1% (95% CI, 2%-0.4%) between 6 and 9 months, with a modest increase in weight of 0.6% (95% CI, −0.1% to 1.3%) between 9 and 12 months.
• By diet order, participants in the LF first arm did not plateau and experienced a similar weight loss from 6 to 9 months as they had experienced from 3 to 6 months (relative change, −0.1%; 95% CI, −1.5% to 1.3%), while the LC first arm essentially nullified the 3-6 month weight loss during the 6-9 month LF phase (relative change, 2.2%; 95% CI, 0.7%-3.6%).
• For the LC first arm, low-density lipoprotein increased at 3 months and decreased when the participants switched to LF at 6 months, whereas the opposite effect was seen for the transition from LF to LC. Triglyceride levels decreased in both intervention arms.
• Insulin levels decreased in both dietary intervention arms between baseline and 6 months and plateaued following the 6-month dietary switch.

IN PRACTICE:

“This suggests that the weight-loss plateau typically seen at 6 months is physiological and cannot be overcome by simply switching to a different weight-loss diet,” wrote the authors. “As a person transitions from a weight loss to weight maintenance phase, a shift in the approach used may be required.”

SOURCE:

The study, led by Matthew J. Landry, Stanford Prevention Research Center, School of Medicine, Stanford University, California, was published in Scientific Reports.

LIMITATIONS:

The study results showed some possible differential trends but also highlighted the small sample size and large variability. Participants may have been unable to provide accurate estimates of self-reported energy intake. The authors also acknowledged that regular physical activity may have contributed to the maintenance of weight loss observed in this study.

DISCLOSURES:

The study was supported by the Hass Avocado Board; Human Health Service grant (General Clinical Research Centers and National Center for Research Resources, National Institutes of Health); National Heart, Lung, and Blood Institute; and Stanford Diabetes Research Center. The authors declared no conflicts of interest.

A version of this article first appeared on Medscape.com.

TOPLINE: 

Individuals with overweight and obesity who reach a weight-loss plateau at around 6 months on a healthy weight-loss diet may not achieve further weight reduction after switching to a different weight-loss diet.

METHODOLOGY:

• Dietary and lifestyle interventions initially result in rapid weight loss, followed by a weight-loss plateau after a few months and weight regain within a year or two, and diet fatigue has been proposed as a cause but not studied.
• This secondary analysis of a randomized trial assessed weight-loss trajectories before and after switching from a healthy low-carbohydrate (LC) diet to a healthy low-fat (LF) diet (or vice versa) in individuals with overweight and obesity.
• Overall, 42 participants (mean age, 42 years; 64% women; 87% White individuals) recruited from a local community in Palo Alto, California, were assigned to the LF or LC diet for the first 6 months, after which they were switched to the other diet for the remaining 6 months.
• Data from the DIETFITS trial, wherein participants remained either on the LF or LC diet for 12 months, were used as historical control.

The primary outcome was percent weight change at 3-6 months vs that observed at 6-9 months.

TAKEAWAY:

• The combined average weight loss was 7% (95% CI, 8%-6%) during the first 3 months, declining to 2% (95% CI, 3%-1%) between 3 and 6 months. On switching diets, the weight loss further slowed to 1% (95% CI, 2%-0.4%) between 6 and 9 months, with a modest increase in weight of 0.6% (95% CI, −0.1% to 1.3%) between 9 and 12 months.
• By diet order, participants in the LF first arm did not plateau and experienced a similar weight loss from 6 to 9 months as they had experienced from 3 to 6 months (relative change, −0.1%; 95% CI, −1.5% to 1.3%), while the LC first arm essentially nullified the 3-6 month weight loss during the 6-9 month LF phase (relative change, 2.2%; 95% CI, 0.7%-3.6%).
• For the LC first arm, low-density lipoprotein increased at 3 months and decreased when the participants switched to LF at 6 months, whereas the opposite effect was seen for the transition from LF to LC. Triglyceride levels decreased in both intervention arms.
• Insulin levels decreased in both dietary intervention arms between baseline and 6 months and plateaued following the 6-month dietary switch.

IN PRACTICE:

“This suggests that the weight-loss plateau typically seen at 6 months is physiological and cannot be overcome by simply switching to a different weight-loss diet,” wrote the authors. “As a person transitions from a weight loss to weight maintenance phase, a shift in the approach used may be required.”

SOURCE:

The study, led by Matthew J. Landry, Stanford Prevention Research Center, School of Medicine, Stanford University, California, was published in Scientific Reports.

LIMITATIONS:

The study results showed some possible differential trends but also highlighted the small sample size and large variability. Participants may have been unable to provide accurate estimates of self-reported energy intake. The authors also acknowledged that regular physical activity may have contributed to the maintenance of weight loss observed in this study.

DISCLOSURES:

The study was supported by the Hass Avocado Board; Human Health Service grant (General Clinical Research Centers and National Center for Research Resources, National Institutes of Health); National Heart, Lung, and Blood Institute; and Stanford Diabetes Research Center. The authors declared no conflicts of interest.

A version of this article first appeared on Medscape.com.

TOPLINE: 

Individuals with overweight and obesity who reach a weight-loss plateau at around 6 months on a healthy weight-loss diet may not achieve further weight reduction after switching to a different weight-loss diet.

METHODOLOGY:

• Dietary and lifestyle interventions initially result in rapid weight loss, followed by a weight-loss plateau after a few months and weight regain within a year or two, and diet fatigue has been proposed as a cause but not studied.
• This secondary analysis of a randomized trial assessed weight-loss trajectories before and after switching from a healthy low-carbohydrate (LC) diet to a healthy low-fat (LF) diet (or vice versa) in individuals with overweight and obesity.
• Overall, 42 participants (mean age, 42 years; 64% women; 87% White individuals) recruited from a local community in Palo Alto, California, were assigned to the LF or LC diet for the first 6 months, after which they were switched to the other diet for the remaining 6 months.
• Data from the DIETFITS trial, wherein participants remained either on the LF or LC diet for 12 months, were used as historical control.

The primary outcome was percent weight change at 3-6 months vs that observed at 6-9 months.

TAKEAWAY:

• The combined average weight loss was 7% (95% CI, 8%-6%) during the first 3 months, declining to 2% (95% CI, 3%-1%) between 3 and 6 months. On switching diets, the weight loss further slowed to 1% (95% CI, 2%-0.4%) between 6 and 9 months, with a modest increase in weight of 0.6% (95% CI, −0.1% to 1.3%) between 9 and 12 months.
• By diet order, participants in the LF first arm did not plateau and experienced a similar weight loss from 6 to 9 months as they had experienced from 3 to 6 months (relative change, −0.1%; 95% CI, −1.5% to 1.3%), while the LC first arm essentially nullified the 3-6 month weight loss during the 6-9 month LF phase (relative change, 2.2%; 95% CI, 0.7%-3.6%).
• For the LC first arm, low-density lipoprotein increased at 3 months and decreased when the participants switched to LF at 6 months, whereas the opposite effect was seen for the transition from LF to LC. Triglyceride levels decreased in both intervention arms.
• Insulin levels decreased in both dietary intervention arms between baseline and 6 months and plateaued following the 6-month dietary switch.

IN PRACTICE:

“This suggests that the weight-loss plateau typically seen at 6 months is physiological and cannot be overcome by simply switching to a different weight-loss diet,” wrote the authors. “As a person transitions from a weight loss to weight maintenance phase, a shift in the approach used may be required.”

SOURCE:

The study, led by Matthew J. Landry, Stanford Prevention Research Center, School of Medicine, Stanford University, California, was published in Scientific Reports.

LIMITATIONS:

The study results showed some possible differential trends but also highlighted the small sample size and large variability. Participants may have been unable to provide accurate estimates of self-reported energy intake. The authors also acknowledged that regular physical activity may have contributed to the maintenance of weight loss observed in this study.

DISCLOSURES:

The study was supported by the Hass Avocado Board; Human Health Service grant (General Clinical Research Centers and National Center for Research Resources, National Institutes of Health); National Heart, Lung, and Blood Institute; and Stanford Diabetes Research Center. The authors declared no conflicts of interest.

A version of this article first appeared on Medscape.com.

Endocrinologists in Europe and the United States have come together to produce joint guidance to help clinicians manage patients who have, or are a at risk for, glucocorticoid-induced adrenal insufficiency (GC-AI).

Publication of the guidance marks the first time that the European Society of Endocrinology (ESE) and the Endocrine Society have cooperated in producing a guideline.

The guideline “Diagnosis and therapy of glucocorticoid-induced adrenal insufficiency” is published in the May 2024 issues of the societies respective journals, the European Journal of Endocrinology and The Journal of Clinical Endocrinology & Metabolism.

Felix Beuschlein, PhD, from the ESE, who cochaired the clinical committee, told this news organization: “You would hope that this leads to a common ground for a very large number of patients.”

The risk for GC-AI is dependent on the dose, duration, and potency of the glucocorticoid; route of administration; as well as susceptibility of the individual patient. Once it develops or is suspected, careful education and management of affected patients is required.
 

Glucocorticoids Commonly Prescribed

“Glucocorticoid-induced adrenal insufficiency is actually a potential concern for a lot of patients,” coauthor Tobias Else, MD, of the department of internal medicine at the University of Michigan, Ann Arbor, explained to this news organization. “Roughly 1% of all people are being treated with glucocorticoids at any given time.”

“That’s a tremendous number, and it gives the scale of the situation,” added Dr. Beuschlein, director of the department of endocrinology, diabetology, and clinical nutrition at University Hospital Zürich in Switzerland. “Now, fortunately, only a very small proportion of patients who are treated with glucocorticoids do have endocrine problems, and this is what this guideline is actually concentrating on.”

Glucocorticoids are effective agents for treating autoimmune and inflammatory disorders. However, they can cause adverse reactions, particularly when administered at high doses and/or for a prolonged period.

Some studies have reported that even low-dose glucocorticoid use, such as prednisone at 2.5-7.5 mg/d, can increase the risk for cardiovascular disease, severe infections, hypertension, diabetes, osteoporosis, and fractures, as well as increase overall mortality with concurrent type 2 diabetes.

Tapering glucocorticoids can be challenging when symptoms of glucocorticoid withdrawal develop, which overlap with those of adrenal insufficiency, the guidelines stated. In general, tapering of glucocorticoids can occur more rapidly within a supraphysiological range, followed by a slower taper when on physiological glucocorticoid dosing.

The degree and persistence of hypothalamic-pituitary-adrenal (HPA) axis suppression after glucocorticoid therapy is stopped depends on overall exposure and recovery of adrenal function. “This is a quite individual situation, as you can imagine, because it’s about sex, age, and comorbidities, the kind of glucocorticoid or other medications that you’re giving,” said Dr. Beuschlein. To cover contingencies, the paper presents tables to explain management covering various eventualities.

Leonie van Hulsteijn, MD, from the department of clinical epidemiology, Leiden University Medical Center, Leiden, the Netherlands, said: “There are so many other specialties prescribing glucocorticoids; so especially the rheumatologist, the pulmonologist, the general practitioners.”

Asked by this news organization whether the guidelines might dissuade some clinicians from offering glucocorticoids, Dr. van Hulsteijn, who contributed to the guidance, said, “I don’t think it will keep them from prescribing it, but I really hope it will make them aware if somebody, after using long-term glucocorticoids, presents with complaints of adrenal insufficiency, that they will be aware and take immediate action.”
 

Evidence Gaps

The review team took around 2.5 years to draw up the guidance amid some concerns about the quality of the evidence base, which they mainly rated as “low” or “very low.” “I think we all, going through the literature, were quite astonished at how bad the evidence is for a problem as global as that,” said Dr. Beuschlein. “But that’s how it is — sometimes, even in the absence of strong evidence, you have to give some kind of guidance.”

Nevertheless, the authors have called for more research to establish risk factors contributing to the development of and susceptibility to adrenal insufficiency, a greater understanding of glucocorticoid withdrawal, and identification of glucocorticoids retaining immunosuppressive and anti-inflammatory properties that have less effect on HPA axis suppression and an improved adverse effect profile.

Patient-facing materials on GC-AI are also in development and will be made available via the ESE Patient Zone this month.

Next year, the societies plan to publish a joint guideline on diabetes in pregnancy. That will be followed in 2026 by guidance on arginine vasopressin resistance and arginine vasopressin deficiency and a guideline on male hypogonadism in 2027.

Funding for the development of joint guidelines was provided by the societies and did not involve support from other bodies.

Dr. Beuschlein declared funding from the German Research Funding Agency, the Swiss National Science Foundation, University Medicine Zürich, the Vontobel Foundation, the Swiss Heart Foundation, and consultancy work for Bayer AG. Dr. Else declared membership of the advisory board of Merck and Company. Dr. van Hulsteijn declared no conflicts of interest.
 

A version of this article appeared on Medscape.com.

Endocrinologists in Europe and the United States have come together to produce joint guidance to help clinicians manage patients who have, or are a at risk for, glucocorticoid-induced adrenal insufficiency (GC-AI).

Publication of the guidance marks the first time that the European Society of Endocrinology (ESE) and the Endocrine Society have cooperated in producing a guideline.

The guideline “Diagnosis and therapy of glucocorticoid-induced adrenal insufficiency” is published in the May 2024 issues of the societies respective journals, the European Journal of Endocrinology and The Journal of Clinical Endocrinology & Metabolism.

Felix Beuschlein, PhD, from the ESE, who cochaired the clinical committee, told this news organization: “You would hope that this leads to a common ground for a very large number of patients.”

The risk for GC-AI is dependent on the dose, duration, and potency of the glucocorticoid; route of administration; as well as susceptibility of the individual patient. Once it develops or is suspected, careful education and management of affected patients is required.
 

Glucocorticoids Commonly Prescribed

“Glucocorticoid-induced adrenal insufficiency is actually a potential concern for a lot of patients,” coauthor Tobias Else, MD, of the department of internal medicine at the University of Michigan, Ann Arbor, explained to this news organization. “Roughly 1% of all people are being treated with glucocorticoids at any given time.”

“That’s a tremendous number, and it gives the scale of the situation,” added Dr. Beuschlein, director of the department of endocrinology, diabetology, and clinical nutrition at University Hospital Zürich in Switzerland. “Now, fortunately, only a very small proportion of patients who are treated with glucocorticoids do have endocrine problems, and this is what this guideline is actually concentrating on.”

Glucocorticoids are effective agents for treating autoimmune and inflammatory disorders. However, they can cause adverse reactions, particularly when administered at high doses and/or for a prolonged period.

Some studies have reported that even low-dose glucocorticoid use, such as prednisone at 2.5-7.5 mg/d, can increase the risk for cardiovascular disease, severe infections, hypertension, diabetes, osteoporosis, and fractures, as well as increase overall mortality with concurrent type 2 diabetes.

Tapering glucocorticoids can be challenging when symptoms of glucocorticoid withdrawal develop, which overlap with those of adrenal insufficiency, the guidelines stated. In general, tapering of glucocorticoids can occur more rapidly within a supraphysiological range, followed by a slower taper when on physiological glucocorticoid dosing.

The degree and persistence of hypothalamic-pituitary-adrenal (HPA) axis suppression after glucocorticoid therapy is stopped depends on overall exposure and recovery of adrenal function. “This is a quite individual situation, as you can imagine, because it’s about sex, age, and comorbidities, the kind of glucocorticoid or other medications that you’re giving,” said Dr. Beuschlein. To cover contingencies, the paper presents tables to explain management covering various eventualities.

Leonie van Hulsteijn, MD, from the department of clinical epidemiology, Leiden University Medical Center, Leiden, the Netherlands, said: “There are so many other specialties prescribing glucocorticoids; so especially the rheumatologist, the pulmonologist, the general practitioners.”

Asked by this news organization whether the guidelines might dissuade some clinicians from offering glucocorticoids, Dr. van Hulsteijn, who contributed to the guidance, said, “I don’t think it will keep them from prescribing it, but I really hope it will make them aware if somebody, after using long-term glucocorticoids, presents with complaints of adrenal insufficiency, that they will be aware and take immediate action.”
 

Evidence Gaps

The review team took around 2.5 years to draw up the guidance amid some concerns about the quality of the evidence base, which they mainly rated as “low” or “very low.” “I think we all, going through the literature, were quite astonished at how bad the evidence is for a problem as global as that,” said Dr. Beuschlein. “But that’s how it is — sometimes, even in the absence of strong evidence, you have to give some kind of guidance.”

Nevertheless, the authors have called for more research to establish risk factors contributing to the development of and susceptibility to adrenal insufficiency, a greater understanding of glucocorticoid withdrawal, and identification of glucocorticoids retaining immunosuppressive and anti-inflammatory properties that have less effect on HPA axis suppression and an improved adverse effect profile.

Patient-facing materials on GC-AI are also in development and will be made available via the ESE Patient Zone this month.

Next year, the societies plan to publish a joint guideline on diabetes in pregnancy. That will be followed in 2026 by guidance on arginine vasopressin resistance and arginine vasopressin deficiency and a guideline on male hypogonadism in 2027.

Funding for the development of joint guidelines was provided by the societies and did not involve support from other bodies.

Dr. Beuschlein declared funding from the German Research Funding Agency, the Swiss National Science Foundation, University Medicine Zürich, the Vontobel Foundation, the Swiss Heart Foundation, and consultancy work for Bayer AG. Dr. Else declared membership of the advisory board of Merck and Company. Dr. van Hulsteijn declared no conflicts of interest.
 

A version of this article appeared on Medscape.com.

Endocrinologists in Europe and the United States have come together to produce joint guidance to help clinicians manage patients who have, or are a at risk for, glucocorticoid-induced adrenal insufficiency (GC-AI).

Publication of the guidance marks the first time that the European Society of Endocrinology (ESE) and the Endocrine Society have cooperated in producing a guideline.

The guideline “Diagnosis and therapy of glucocorticoid-induced adrenal insufficiency” is published in the May 2024 issues of the societies respective journals, the European Journal of Endocrinology and The Journal of Clinical Endocrinology & Metabolism.

Felix Beuschlein, PhD, from the ESE, who cochaired the clinical committee, told this news organization: “You would hope that this leads to a common ground for a very large number of patients.”

The risk for GC-AI is dependent on the dose, duration, and potency of the glucocorticoid; route of administration; as well as susceptibility of the individual patient. Once it develops or is suspected, careful education and management of affected patients is required.
 

Glucocorticoids Commonly Prescribed

“Glucocorticoid-induced adrenal insufficiency is actually a potential concern for a lot of patients,” coauthor Tobias Else, MD, of the department of internal medicine at the University of Michigan, Ann Arbor, explained to this news organization. “Roughly 1% of all people are being treated with glucocorticoids at any given time.”

“That’s a tremendous number, and it gives the scale of the situation,” added Dr. Beuschlein, director of the department of endocrinology, diabetology, and clinical nutrition at University Hospital Zürich in Switzerland. “Now, fortunately, only a very small proportion of patients who are treated with glucocorticoids do have endocrine problems, and this is what this guideline is actually concentrating on.”

Glucocorticoids are effective agents for treating autoimmune and inflammatory disorders. However, they can cause adverse reactions, particularly when administered at high doses and/or for a prolonged period.

Some studies have reported that even low-dose glucocorticoid use, such as prednisone at 2.5-7.5 mg/d, can increase the risk for cardiovascular disease, severe infections, hypertension, diabetes, osteoporosis, and fractures, as well as increase overall mortality with concurrent type 2 diabetes.

Tapering glucocorticoids can be challenging when symptoms of glucocorticoid withdrawal develop, which overlap with those of adrenal insufficiency, the guidelines stated. In general, tapering of glucocorticoids can occur more rapidly within a supraphysiological range, followed by a slower taper when on physiological glucocorticoid dosing.

The degree and persistence of hypothalamic-pituitary-adrenal (HPA) axis suppression after glucocorticoid therapy is stopped depends on overall exposure and recovery of adrenal function. “This is a quite individual situation, as you can imagine, because it’s about sex, age, and comorbidities, the kind of glucocorticoid or other medications that you’re giving,” said Dr. Beuschlein. To cover contingencies, the paper presents tables to explain management covering various eventualities.

Leonie van Hulsteijn, MD, from the department of clinical epidemiology, Leiden University Medical Center, Leiden, the Netherlands, said: “There are so many other specialties prescribing glucocorticoids; so especially the rheumatologist, the pulmonologist, the general practitioners.”

Asked by this news organization whether the guidelines might dissuade some clinicians from offering glucocorticoids, Dr. van Hulsteijn, who contributed to the guidance, said, “I don’t think it will keep them from prescribing it, but I really hope it will make them aware if somebody, after using long-term glucocorticoids, presents with complaints of adrenal insufficiency, that they will be aware and take immediate action.”
 

Evidence Gaps

The review team took around 2.5 years to draw up the guidance amid some concerns about the quality of the evidence base, which they mainly rated as “low” or “very low.” “I think we all, going through the literature, were quite astonished at how bad the evidence is for a problem as global as that,” said Dr. Beuschlein. “But that’s how it is — sometimes, even in the absence of strong evidence, you have to give some kind of guidance.”

Nevertheless, the authors have called for more research to establish risk factors contributing to the development of and susceptibility to adrenal insufficiency, a greater understanding of glucocorticoid withdrawal, and identification of glucocorticoids retaining immunosuppressive and anti-inflammatory properties that have less effect on HPA axis suppression and an improved adverse effect profile.

Patient-facing materials on GC-AI are also in development and will be made available via the ESE Patient Zone this month.

Next year, the societies plan to publish a joint guideline on diabetes in pregnancy. That will be followed in 2026 by guidance on arginine vasopressin resistance and arginine vasopressin deficiency and a guideline on male hypogonadism in 2027.

Funding for the development of joint guidelines was provided by the societies and did not involve support from other bodies.

Dr. Beuschlein declared funding from the German Research Funding Agency, the Swiss National Science Foundation, University Medicine Zürich, the Vontobel Foundation, the Swiss Heart Foundation, and consultancy work for Bayer AG. Dr. Else declared membership of the advisory board of Merck and Company. Dr. van Hulsteijn declared no conflicts of interest.
 

A version of this article appeared on Medscape.com.

In a recent article in the American Journal of Obstetrics & Gynecology, Rebecca C. Thurston, PhD, and Pauline Maki, PhD, leading scientists in the area of menopause’s impact on brain function, presented data from their assessment of 248 late perimenopausal and postmenopausal women who reported hot flashes, also known as vasomotor symptoms (VMS).

Hot flashes are known to be associated with changes in brain white matter, carotid atherosclerosis, brain function, and memory. Dr. Thurston and colleagues objectively measured VMS over 24 hours, using skin conductance monitoring. Plasma concentrations of Alzheimer’s disease biomarkers, including the amyloid beta 42–to–amyloid beta 40 ratio, were assessed. The mean age of study participants was 59 years, and they experienced a mean of five objective VMS daily.

A key finding was that VMS, particularly those occurring during sleep, were associated with a significantly lower amyloid beta 42–to–beta 40 ratio. This finding suggests that nighttime VMS may be a marker of risk for Alzheimer’s disease.

Previous research has found that menopausal hormone therapy is associated with favorable changes in Alzheimer’s disease biomarkers. Likewise, large observational studies have shown a lower incidence of Alzheimer’s disease among women who initiate hormone therapy in their late perimenopausal or early postmenopausal years and continue such therapy long term.

The findings of this important study by Thurston and colleagues provide further evidence to support the tantalizing possibility that agents that reduce nighttime hot flashes (including hormone therapy) may lower the subsequent incidence of Alzheimer’s disease in high-risk women.
 

Dr. Kaunitz is a tenured professor and associate chair in the department of obstetrics and gynecology at the University of Florida College of Medicine–Jacksonville, and medical director and director of menopause and gynecologic ultrasound services at the University of Florida Southside Women’s Health, Jacksonville. He disclosed ties to Sumitomo Pharma America, Mithra, Viatris, Bayer, Merck, Mylan (Viatris), and UpToDate.

A version of this article appeared on Medscape.com.

In a recent article in the American Journal of Obstetrics & Gynecology, Rebecca C. Thurston, PhD, and Pauline Maki, PhD, leading scientists in the area of menopause’s impact on brain function, presented data from their assessment of 248 late perimenopausal and postmenopausal women who reported hot flashes, also known as vasomotor symptoms (VMS).

Hot flashes are known to be associated with changes in brain white matter, carotid atherosclerosis, brain function, and memory. Dr. Thurston and colleagues objectively measured VMS over 24 hours, using skin conductance monitoring. Plasma concentrations of Alzheimer’s disease biomarkers, including the amyloid beta 42–to–amyloid beta 40 ratio, were assessed. The mean age of study participants was 59 years, and they experienced a mean of five objective VMS daily.

A key finding was that VMS, particularly those occurring during sleep, were associated with a significantly lower amyloid beta 42–to–beta 40 ratio. This finding suggests that nighttime VMS may be a marker of risk for Alzheimer’s disease.

Previous research has found that menopausal hormone therapy is associated with favorable changes in Alzheimer’s disease biomarkers. Likewise, large observational studies have shown a lower incidence of Alzheimer’s disease among women who initiate hormone therapy in their late perimenopausal or early postmenopausal years and continue such therapy long term.

The findings of this important study by Thurston and colleagues provide further evidence to support the tantalizing possibility that agents that reduce nighttime hot flashes (including hormone therapy) may lower the subsequent incidence of Alzheimer’s disease in high-risk women.
 

Dr. Kaunitz is a tenured professor and associate chair in the department of obstetrics and gynecology at the University of Florida College of Medicine–Jacksonville, and medical director and director of menopause and gynecologic ultrasound services at the University of Florida Southside Women’s Health, Jacksonville. He disclosed ties to Sumitomo Pharma America, Mithra, Viatris, Bayer, Merck, Mylan (Viatris), and UpToDate.

A version of this article appeared on Medscape.com.

In a recent article in the American Journal of Obstetrics & Gynecology, Rebecca C. Thurston, PhD, and Pauline Maki, PhD, leading scientists in the area of menopause’s impact on brain function, presented data from their assessment of 248 late perimenopausal and postmenopausal women who reported hot flashes, also known as vasomotor symptoms (VMS).

Hot flashes are known to be associated with changes in brain white matter, carotid atherosclerosis, brain function, and memory. Dr. Thurston and colleagues objectively measured VMS over 24 hours, using skin conductance monitoring. Plasma concentrations of Alzheimer’s disease biomarkers, including the amyloid beta 42–to–amyloid beta 40 ratio, were assessed. The mean age of study participants was 59 years, and they experienced a mean of five objective VMS daily.

A key finding was that VMS, particularly those occurring during sleep, were associated with a significantly lower amyloid beta 42–to–beta 40 ratio. This finding suggests that nighttime VMS may be a marker of risk for Alzheimer’s disease.

Previous research has found that menopausal hormone therapy is associated with favorable changes in Alzheimer’s disease biomarkers. Likewise, large observational studies have shown a lower incidence of Alzheimer’s disease among women who initiate hormone therapy in their late perimenopausal or early postmenopausal years and continue such therapy long term.

The findings of this important study by Thurston and colleagues provide further evidence to support the tantalizing possibility that agents that reduce nighttime hot flashes (including hormone therapy) may lower the subsequent incidence of Alzheimer’s disease in high-risk women.
 

Dr. Kaunitz is a tenured professor and associate chair in the department of obstetrics and gynecology at the University of Florida College of Medicine–Jacksonville, and medical director and director of menopause and gynecologic ultrasound services at the University of Florida Southside Women’s Health, Jacksonville. He disclosed ties to Sumitomo Pharma America, Mithra, Viatris, Bayer, Merck, Mylan (Viatris), and UpToDate.

A version of this article appeared on Medscape.com.

A new systematic literature review adds complexity to the controversy over testosterone’s relationship to risk for myocardial infarction, stroke, cardiovascular death, and all-cause mortality.

Last year, the TRAVERSE (Testosterone Replacement Therapy for Assessment of Long-term Vascular Events and Efficacy ResponSE in Hypogonadal Men) trial was the first randomized, placebo-controlled study designed and powered to determine whether testosterone therapy increased risk for major cardiovascular events in men (ages 45-80 years). Its conclusions provided reassurance that modest use of testosterone therapy short term does not increase CVD risk.

But other studies have had different conclusions and TRAVERSE left unanswered questions, so Bu B. Yeap, MBBS, PhD, an endocrinologist at the University of Western Australia in Crawley, and colleagues completed a literature review with 11 prospective cohort studies of community-dwelling men with sex steroid levels measured with mass spectrometry. Nine of the studies provided individual participation data (IPD); two used aggregate data, and all had at least 5 years of follow-up.

The findings were published in Annals of Internal Medicine .

Dr. Yeap’s team concluded that certain groups of men have higher risk for CVD events. In this study, men with very low testosterone, high luteinizing hormone (LH), or very low estradiol concentrations had higher all-cause mortality. Sex hormone–binding globulin (SHBG) concentration was positively associated and dihydrotestosterone (DHT) levels were nonlinearly associated with all-cause mortality and CVD mortality.

The testosterone level below which men had higher risk of death from any cause was 7.4 nmol/L (213 ng/dL), regardless of LH concentration, the researchers concluded, writing, “This adds to information on reference ranges based on distributions of testosterone in selected samples of healthy men.”

The link between higher SHBG concentrations and higher all-cause mortality “may be related to its role as the major binding protein for sex steroids in the circulation,” the authors wrote. “We found a U-shaped association of DHT with all-cause and CVD-related mortality risks, which were higher at lower and very high DHT concentrations. Men with very low DHT concentrations also had increased risk for incident CVD events. Further investigation into potential underlying mechanisms for these associations is warranted.”
 

Rigorous Methodology Adds Value

Bradley D. Anawalt, MD, with the University of Washington School of Medicine in Seattle, pointed out in an accompanying editorial that the study’s findings are particularly valuable because of the team’s rigorous methodology. The team measured testosterone with the gold standard, mass spectrometry, which can also measure DHT and estradiol more accurately than widely available commercial immunoassays, which “are inaccurate for measurement of these sex steroids in men, who typically have low serum concentrations of these two metabolites of testosterone,” Dr. Anawalt said.

Also, the researchers obtained raw data from the nine IPD studies and reanalyzed the combined data, which allows for more sophisticated analysis when combining data from multiple studies, Dr. Anawalt explained.

The main finding from the Yeap et al. study, he wrote, is that high testosterone concentrations at baseline were not linked with increased deaths from CVD or from all causes “but very low serum total testosterone concentrations at baseline were.

“It is tempting to hypothesize that testosterone therapy might have cardiovascular benefits solely in patients with very low concentrations of serum total testosterone,” Dr. Anawalt wrote.

He pointed out as particularly interesting the findings for DHT and estradiol.

“The finding that a low serum estradiol concentration is associated with higher all-cause mortality adds another reason (in addition to the adverse effects on body fat and bone health) to avoid aromatase inhibitors that are commonly taken by persons who use anabolic steroids,” he wrote. “The prospect of a U-shaped curve for the relationship between serum DHT and higher cardiovascular risk warrants further study.”

The work is funded by the Government of Western Australia and Lawley Pharmaceuticals. The authors’ and editorial writer’s conflicts of interest are listed in the full study.

A new systematic literature review adds complexity to the controversy over testosterone’s relationship to risk for myocardial infarction, stroke, cardiovascular death, and all-cause mortality.

Last year, the TRAVERSE (Testosterone Replacement Therapy for Assessment of Long-term Vascular Events and Efficacy ResponSE in Hypogonadal Men) trial was the first randomized, placebo-controlled study designed and powered to determine whether testosterone therapy increased risk for major cardiovascular events in men (ages 45-80 years). Its conclusions provided reassurance that modest use of testosterone therapy short term does not increase CVD risk.

But other studies have had different conclusions and TRAVERSE left unanswered questions, so Bu B. Yeap, MBBS, PhD, an endocrinologist at the University of Western Australia in Crawley, and colleagues completed a literature review with 11 prospective cohort studies of community-dwelling men with sex steroid levels measured with mass spectrometry. Nine of the studies provided individual participation data (IPD); two used aggregate data, and all had at least 5 years of follow-up.

The findings were published in Annals of Internal Medicine .

Dr. Yeap’s team concluded that certain groups of men have higher risk for CVD events. In this study, men with very low testosterone, high luteinizing hormone (LH), or very low estradiol concentrations had higher all-cause mortality. Sex hormone–binding globulin (SHBG) concentration was positively associated and dihydrotestosterone (DHT) levels were nonlinearly associated with all-cause mortality and CVD mortality.

The testosterone level below which men had higher risk of death from any cause was 7.4 nmol/L (213 ng/dL), regardless of LH concentration, the researchers concluded, writing, “This adds to information on reference ranges based on distributions of testosterone in selected samples of healthy men.”

The link between higher SHBG concentrations and higher all-cause mortality “may be related to its role as the major binding protein for sex steroids in the circulation,” the authors wrote. “We found a U-shaped association of DHT with all-cause and CVD-related mortality risks, which were higher at lower and very high DHT concentrations. Men with very low DHT concentrations also had increased risk for incident CVD events. Further investigation into potential underlying mechanisms for these associations is warranted.”
 

Rigorous Methodology Adds Value

Bradley D. Anawalt, MD, with the University of Washington School of Medicine in Seattle, pointed out in an accompanying editorial that the study’s findings are particularly valuable because of the team’s rigorous methodology. The team measured testosterone with the gold standard, mass spectrometry, which can also measure DHT and estradiol more accurately than widely available commercial immunoassays, which “are inaccurate for measurement of these sex steroids in men, who typically have low serum concentrations of these two metabolites of testosterone,” Dr. Anawalt said.

Also, the researchers obtained raw data from the nine IPD studies and reanalyzed the combined data, which allows for more sophisticated analysis when combining data from multiple studies, Dr. Anawalt explained.

The main finding from the Yeap et al. study, he wrote, is that high testosterone concentrations at baseline were not linked with increased deaths from CVD or from all causes “but very low serum total testosterone concentrations at baseline were.

“It is tempting to hypothesize that testosterone therapy might have cardiovascular benefits solely in patients with very low concentrations of serum total testosterone,” Dr. Anawalt wrote.

He pointed out as particularly interesting the findings for DHT and estradiol.

“The finding that a low serum estradiol concentration is associated with higher all-cause mortality adds another reason (in addition to the adverse effects on body fat and bone health) to avoid aromatase inhibitors that are commonly taken by persons who use anabolic steroids,” he wrote. “The prospect of a U-shaped curve for the relationship between serum DHT and higher cardiovascular risk warrants further study.”

The work is funded by the Government of Western Australia and Lawley Pharmaceuticals. The authors’ and editorial writer’s conflicts of interest are listed in the full study.

A new systematic literature review adds complexity to the controversy over testosterone’s relationship to risk for myocardial infarction, stroke, cardiovascular death, and all-cause mortality.

Last year, the TRAVERSE (Testosterone Replacement Therapy for Assessment of Long-term Vascular Events and Efficacy ResponSE in Hypogonadal Men) trial was the first randomized, placebo-controlled study designed and powered to determine whether testosterone therapy increased risk for major cardiovascular events in men (ages 45-80 years). Its conclusions provided reassurance that modest use of testosterone therapy short term does not increase CVD risk.

But other studies have had different conclusions and TRAVERSE left unanswered questions, so Bu B. Yeap, MBBS, PhD, an endocrinologist at the University of Western Australia in Crawley, and colleagues completed a literature review with 11 prospective cohort studies of community-dwelling men with sex steroid levels measured with mass spectrometry. Nine of the studies provided individual participation data (IPD); two used aggregate data, and all had at least 5 years of follow-up.

The findings were published in Annals of Internal Medicine .

Dr. Yeap’s team concluded that certain groups of men have higher risk for CVD events. In this study, men with very low testosterone, high luteinizing hormone (LH), or very low estradiol concentrations had higher all-cause mortality. Sex hormone–binding globulin (SHBG) concentration was positively associated and dihydrotestosterone (DHT) levels were nonlinearly associated with all-cause mortality and CVD mortality.

The testosterone level below which men had higher risk of death from any cause was 7.4 nmol/L (213 ng/dL), regardless of LH concentration, the researchers concluded, writing, “This adds to information on reference ranges based on distributions of testosterone in selected samples of healthy men.”

The link between higher SHBG concentrations and higher all-cause mortality “may be related to its role as the major binding protein for sex steroids in the circulation,” the authors wrote. “We found a U-shaped association of DHT with all-cause and CVD-related mortality risks, which were higher at lower and very high DHT concentrations. Men with very low DHT concentrations also had increased risk for incident CVD events. Further investigation into potential underlying mechanisms for these associations is warranted.”
 

Rigorous Methodology Adds Value

Bradley D. Anawalt, MD, with the University of Washington School of Medicine in Seattle, pointed out in an accompanying editorial that the study’s findings are particularly valuable because of the team’s rigorous methodology. The team measured testosterone with the gold standard, mass spectrometry, which can also measure DHT and estradiol more accurately than widely available commercial immunoassays, which “are inaccurate for measurement of these sex steroids in men, who typically have low serum concentrations of these two metabolites of testosterone,” Dr. Anawalt said.

Also, the researchers obtained raw data from the nine IPD studies and reanalyzed the combined data, which allows for more sophisticated analysis when combining data from multiple studies, Dr. Anawalt explained.

The main finding from the Yeap et al. study, he wrote, is that high testosterone concentrations at baseline were not linked with increased deaths from CVD or from all causes “but very low serum total testosterone concentrations at baseline were.

“It is tempting to hypothesize that testosterone therapy might have cardiovascular benefits solely in patients with very low concentrations of serum total testosterone,” Dr. Anawalt wrote.

He pointed out as particularly interesting the findings for DHT and estradiol.

“The finding that a low serum estradiol concentration is associated with higher all-cause mortality adds another reason (in addition to the adverse effects on body fat and bone health) to avoid aromatase inhibitors that are commonly taken by persons who use anabolic steroids,” he wrote. “The prospect of a U-shaped curve for the relationship between serum DHT and higher cardiovascular risk warrants further study.”

The work is funded by the Government of Western Australia and Lawley Pharmaceuticals. The authors’ and editorial writer’s conflicts of interest are listed in the full study.