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An intensive weight-loss intervention prior to conception had no effect on birth rates in women with obesity and unexplained infertility, compared with a standard weight-maintenance program, based on data from nearly 400 women.
Obese women experiencing infertility are often counseled to lose weight before attempting fertility treatments in order to improve outcomes based on epidemiologic evidence of an association between obesity and infertility, but data to support this advice are limited, wrote Richard S. Legro, MD, of Penn State University, Hershey, and colleagues.
The researchers proposed that a more intensive preconception weight loss intervention followed by infertility treatment would be more likely to yield a healthy live birth, compared with a standard weight maintenance intervention.
In an open-label study published in PLOS Medicine, the researchers randomized 379 women at nine academic centers to a standard lifestyle group that followed a weight-maintenance plan focused on physical activity, but not weight loss; or an intensive intervention of diet and medication with a target weight loss of 7%. Both interventions lasted for 16 weeks between July 2015 and July 2018. After the interventions, patients in both groups underwent standardized empiric fertility treatment with three cycles of ovarian stimulation and intrauterine insemination.
The primary outcome was a live birth at 37 weeks’ gestation or later, with no congenital abnormalities and a birth weight between 2,500 g and 4,000 g. Baseline characteristics including age, education level, race, and body mass index (BMI) were similar between the groups.
The incidence of healthy live births was not significantly different between the standard treatment and intensive treatment groups (15.2% vs. 12.2%; P = 0.40) by the final follow-up time of September 2019. However, women in the intensive group had significantly greater weight loss, compared with the standard group (–6.6% vs. –0.3%; P < .001). Women in the intensive group also showed improvements in metabolic health. Notably, the incidence of metabolic syndrome dropped from 53.6% to 49.4% in the standard group, compared with a decrease from 52.8% to 32.2% in the intensive group over the 16-week study period, the researchers wrote.
Gastrointestinal side effects were significantly more common in the intensive group, but these were consistent with documented side effects of the weight loss medication used (Orlistat).
First-trimester pregnancy loss was higher in the intensive group, compared with the standard group (33.3% vs. 23.7%), but the difference was not significant. Most pregnancy complications, including preterm labor, premature rupture of membranes, preeclampsia, and gestational diabetes had nonsignificant improvements in the intensive group, compared with the standard group. Similarly, nonsignificant improvements were noted in the intervention group for intrauterine growth restriction and admission to the neonatal ICU.
Limitations of the study included the relatively small number of pregnancies, which prevented assessment of rare complications in subgroups, and the challenge of matching control interventions, the researchers noted.
However, the results were strengthened by the focus on women with unexplained infertility, the inclusion of a comparison group, and the collection of data on complications after conception, they wrote.
Avenues for future research include interventions of different duration and intensity prior to conception, which may improve outcomes, the researchers said in their discussion of the findings. “A period of weight stabilization and maintenance after a weight-loss intervention prior to commencing infertility therapy is worth exploring,” they noted, but couples eager to conceive may be reluctant to wait for a weight-loss intervention, they added.
“Our findings directly impact current standards of clinical care, where women who are obese with unexplained infertility are to our knowledge routinely counseled to lose weight prior to initiation of infertility treatment,” they concluded.
Data may inform patient discussions
The current study is important because a large amount of previous research has shown an association between obesity and decreased fecundity in women and men, Mark P. Trolice, MD, of the University of Central Florida, Orlando, and director of the IVF Center in Winter Park, Fla., said in an interview.
According to the Centers for Disease Control and Prevention, the prevalence of obesity in the United States remains more than 40%, said Dr. Trolice. “Patients and physicians would benefit from clarity of obesity’s effect, if any, on reproduction,” he noted.
In contrast to the authors’ hypothesis, “the study did not find a difference in the live birth rate following up to three cycles of intrauterine insemination (IUI) between an intensive weight loss group [and] women who exercised without weight loss,” said Dr. Trolice. “Prior to this study, many reports suggested a decline in fertility with elevations in BMI, particularly during fertility treatment,” he added.
The take-home message from the current study is a that an elevated BMI, while possibly increasing the risks of metabolic disorders, did not appear to impact fecundity, he said.
The authors therefore concluded, “There is not strong evidence to recommend weight loss prior to conception in women who are obese with unexplained infertility,” Dr. Trolice said.
Regardless of the potential effect of preconception weight loss on fertility, barriers to starting a weight loss program include a woman’s eagerness to move forward with fertility treatments without waiting for weight loss, Dr. Trolice noted. “By the time a woman reaches an infertility specialist, she has been trying to conceive for at least 1 year,” he said. “At the initial consultation, these patients are anxious to undergo necessary additional diagnostic testing followed by treatment. Consequently, initiation of a weight-loss program is viewed as a delay toward the goal of family building,” he explained.
“More research is needed to demonstrate the safety of intensive weight loss preconception,” said Dr. Trolice. However, he said, “the issue of elevated BMI and increased risk of pregnancy complications remains, but this study provides important information for providers regarding counseling their patients desiring pregnancy.”
The study was supported by multiple grants from the National Institutes of Health through the Eunice Kennedy Shriver National Institute of Child Health and Human Development and the National Center for Advancing Translational Sciences. Nutrisystem provided discounted coupons for food allotments in the standardized treatment group, and FitBit provided the study organizers with discounted Fitbits for activity monitoring. Lead author Dr. Legro disclosed consulting fees from InSupp, Ferring, Bayer, Abbvie and Fractyl, and research sponsorship from Guerbet and the National Institutes of Health. Dr. Trolice had no financial conflicts to disclose and serves on the Editorial Advisory Board of Ob.Gyn News.
An intensive weight-loss intervention prior to conception had no effect on birth rates in women with obesity and unexplained infertility, compared with a standard weight-maintenance program, based on data from nearly 400 women.
Obese women experiencing infertility are often counseled to lose weight before attempting fertility treatments in order to improve outcomes based on epidemiologic evidence of an association between obesity and infertility, but data to support this advice are limited, wrote Richard S. Legro, MD, of Penn State University, Hershey, and colleagues.
The researchers proposed that a more intensive preconception weight loss intervention followed by infertility treatment would be more likely to yield a healthy live birth, compared with a standard weight maintenance intervention.
In an open-label study published in PLOS Medicine, the researchers randomized 379 women at nine academic centers to a standard lifestyle group that followed a weight-maintenance plan focused on physical activity, but not weight loss; or an intensive intervention of diet and medication with a target weight loss of 7%. Both interventions lasted for 16 weeks between July 2015 and July 2018. After the interventions, patients in both groups underwent standardized empiric fertility treatment with three cycles of ovarian stimulation and intrauterine insemination.
The primary outcome was a live birth at 37 weeks’ gestation or later, with no congenital abnormalities and a birth weight between 2,500 g and 4,000 g. Baseline characteristics including age, education level, race, and body mass index (BMI) were similar between the groups.
The incidence of healthy live births was not significantly different between the standard treatment and intensive treatment groups (15.2% vs. 12.2%; P = 0.40) by the final follow-up time of September 2019. However, women in the intensive group had significantly greater weight loss, compared with the standard group (–6.6% vs. –0.3%; P < .001). Women in the intensive group also showed improvements in metabolic health. Notably, the incidence of metabolic syndrome dropped from 53.6% to 49.4% in the standard group, compared with a decrease from 52.8% to 32.2% in the intensive group over the 16-week study period, the researchers wrote.
Gastrointestinal side effects were significantly more common in the intensive group, but these were consistent with documented side effects of the weight loss medication used (Orlistat).
First-trimester pregnancy loss was higher in the intensive group, compared with the standard group (33.3% vs. 23.7%), but the difference was not significant. Most pregnancy complications, including preterm labor, premature rupture of membranes, preeclampsia, and gestational diabetes had nonsignificant improvements in the intensive group, compared with the standard group. Similarly, nonsignificant improvements were noted in the intervention group for intrauterine growth restriction and admission to the neonatal ICU.
Limitations of the study included the relatively small number of pregnancies, which prevented assessment of rare complications in subgroups, and the challenge of matching control interventions, the researchers noted.
However, the results were strengthened by the focus on women with unexplained infertility, the inclusion of a comparison group, and the collection of data on complications after conception, they wrote.
Avenues for future research include interventions of different duration and intensity prior to conception, which may improve outcomes, the researchers said in their discussion of the findings. “A period of weight stabilization and maintenance after a weight-loss intervention prior to commencing infertility therapy is worth exploring,” they noted, but couples eager to conceive may be reluctant to wait for a weight-loss intervention, they added.
“Our findings directly impact current standards of clinical care, where women who are obese with unexplained infertility are to our knowledge routinely counseled to lose weight prior to initiation of infertility treatment,” they concluded.
Data may inform patient discussions
The current study is important because a large amount of previous research has shown an association between obesity and decreased fecundity in women and men, Mark P. Trolice, MD, of the University of Central Florida, Orlando, and director of the IVF Center in Winter Park, Fla., said in an interview.
According to the Centers for Disease Control and Prevention, the prevalence of obesity in the United States remains more than 40%, said Dr. Trolice. “Patients and physicians would benefit from clarity of obesity’s effect, if any, on reproduction,” he noted.
In contrast to the authors’ hypothesis, “the study did not find a difference in the live birth rate following up to three cycles of intrauterine insemination (IUI) between an intensive weight loss group [and] women who exercised without weight loss,” said Dr. Trolice. “Prior to this study, many reports suggested a decline in fertility with elevations in BMI, particularly during fertility treatment,” he added.
The take-home message from the current study is a that an elevated BMI, while possibly increasing the risks of metabolic disorders, did not appear to impact fecundity, he said.
The authors therefore concluded, “There is not strong evidence to recommend weight loss prior to conception in women who are obese with unexplained infertility,” Dr. Trolice said.
Regardless of the potential effect of preconception weight loss on fertility, barriers to starting a weight loss program include a woman’s eagerness to move forward with fertility treatments without waiting for weight loss, Dr. Trolice noted. “By the time a woman reaches an infertility specialist, she has been trying to conceive for at least 1 year,” he said. “At the initial consultation, these patients are anxious to undergo necessary additional diagnostic testing followed by treatment. Consequently, initiation of a weight-loss program is viewed as a delay toward the goal of family building,” he explained.
“More research is needed to demonstrate the safety of intensive weight loss preconception,” said Dr. Trolice. However, he said, “the issue of elevated BMI and increased risk of pregnancy complications remains, but this study provides important information for providers regarding counseling their patients desiring pregnancy.”
The study was supported by multiple grants from the National Institutes of Health through the Eunice Kennedy Shriver National Institute of Child Health and Human Development and the National Center for Advancing Translational Sciences. Nutrisystem provided discounted coupons for food allotments in the standardized treatment group, and FitBit provided the study organizers with discounted Fitbits for activity monitoring. Lead author Dr. Legro disclosed consulting fees from InSupp, Ferring, Bayer, Abbvie and Fractyl, and research sponsorship from Guerbet and the National Institutes of Health. Dr. Trolice had no financial conflicts to disclose and serves on the Editorial Advisory Board of Ob.Gyn News.
An intensive weight-loss intervention prior to conception had no effect on birth rates in women with obesity and unexplained infertility, compared with a standard weight-maintenance program, based on data from nearly 400 women.
Obese women experiencing infertility are often counseled to lose weight before attempting fertility treatments in order to improve outcomes based on epidemiologic evidence of an association between obesity and infertility, but data to support this advice are limited, wrote Richard S. Legro, MD, of Penn State University, Hershey, and colleagues.
The researchers proposed that a more intensive preconception weight loss intervention followed by infertility treatment would be more likely to yield a healthy live birth, compared with a standard weight maintenance intervention.
In an open-label study published in PLOS Medicine, the researchers randomized 379 women at nine academic centers to a standard lifestyle group that followed a weight-maintenance plan focused on physical activity, but not weight loss; or an intensive intervention of diet and medication with a target weight loss of 7%. Both interventions lasted for 16 weeks between July 2015 and July 2018. After the interventions, patients in both groups underwent standardized empiric fertility treatment with three cycles of ovarian stimulation and intrauterine insemination.
The primary outcome was a live birth at 37 weeks’ gestation or later, with no congenital abnormalities and a birth weight between 2,500 g and 4,000 g. Baseline characteristics including age, education level, race, and body mass index (BMI) were similar between the groups.
The incidence of healthy live births was not significantly different between the standard treatment and intensive treatment groups (15.2% vs. 12.2%; P = 0.40) by the final follow-up time of September 2019. However, women in the intensive group had significantly greater weight loss, compared with the standard group (–6.6% vs. –0.3%; P < .001). Women in the intensive group also showed improvements in metabolic health. Notably, the incidence of metabolic syndrome dropped from 53.6% to 49.4% in the standard group, compared with a decrease from 52.8% to 32.2% in the intensive group over the 16-week study period, the researchers wrote.
Gastrointestinal side effects were significantly more common in the intensive group, but these were consistent with documented side effects of the weight loss medication used (Orlistat).
First-trimester pregnancy loss was higher in the intensive group, compared with the standard group (33.3% vs. 23.7%), but the difference was not significant. Most pregnancy complications, including preterm labor, premature rupture of membranes, preeclampsia, and gestational diabetes had nonsignificant improvements in the intensive group, compared with the standard group. Similarly, nonsignificant improvements were noted in the intervention group for intrauterine growth restriction and admission to the neonatal ICU.
Limitations of the study included the relatively small number of pregnancies, which prevented assessment of rare complications in subgroups, and the challenge of matching control interventions, the researchers noted.
However, the results were strengthened by the focus on women with unexplained infertility, the inclusion of a comparison group, and the collection of data on complications after conception, they wrote.
Avenues for future research include interventions of different duration and intensity prior to conception, which may improve outcomes, the researchers said in their discussion of the findings. “A period of weight stabilization and maintenance after a weight-loss intervention prior to commencing infertility therapy is worth exploring,” they noted, but couples eager to conceive may be reluctant to wait for a weight-loss intervention, they added.
“Our findings directly impact current standards of clinical care, where women who are obese with unexplained infertility are to our knowledge routinely counseled to lose weight prior to initiation of infertility treatment,” they concluded.
Data may inform patient discussions
The current study is important because a large amount of previous research has shown an association between obesity and decreased fecundity in women and men, Mark P. Trolice, MD, of the University of Central Florida, Orlando, and director of the IVF Center in Winter Park, Fla., said in an interview.
According to the Centers for Disease Control and Prevention, the prevalence of obesity in the United States remains more than 40%, said Dr. Trolice. “Patients and physicians would benefit from clarity of obesity’s effect, if any, on reproduction,” he noted.
In contrast to the authors’ hypothesis, “the study did not find a difference in the live birth rate following up to three cycles of intrauterine insemination (IUI) between an intensive weight loss group [and] women who exercised without weight loss,” said Dr. Trolice. “Prior to this study, many reports suggested a decline in fertility with elevations in BMI, particularly during fertility treatment,” he added.
The take-home message from the current study is a that an elevated BMI, while possibly increasing the risks of metabolic disorders, did not appear to impact fecundity, he said.
The authors therefore concluded, “There is not strong evidence to recommend weight loss prior to conception in women who are obese with unexplained infertility,” Dr. Trolice said.
Regardless of the potential effect of preconception weight loss on fertility, barriers to starting a weight loss program include a woman’s eagerness to move forward with fertility treatments without waiting for weight loss, Dr. Trolice noted. “By the time a woman reaches an infertility specialist, she has been trying to conceive for at least 1 year,” he said. “At the initial consultation, these patients are anxious to undergo necessary additional diagnostic testing followed by treatment. Consequently, initiation of a weight-loss program is viewed as a delay toward the goal of family building,” he explained.
“More research is needed to demonstrate the safety of intensive weight loss preconception,” said Dr. Trolice. However, he said, “the issue of elevated BMI and increased risk of pregnancy complications remains, but this study provides important information for providers regarding counseling their patients desiring pregnancy.”
The study was supported by multiple grants from the National Institutes of Health through the Eunice Kennedy Shriver National Institute of Child Health and Human Development and the National Center for Advancing Translational Sciences. Nutrisystem provided discounted coupons for food allotments in the standardized treatment group, and FitBit provided the study organizers with discounted Fitbits for activity monitoring. Lead author Dr. Legro disclosed consulting fees from InSupp, Ferring, Bayer, Abbvie and Fractyl, and research sponsorship from Guerbet and the National Institutes of Health. Dr. Trolice had no financial conflicts to disclose and serves on the Editorial Advisory Board of Ob.Gyn News.
FROM PLOS MEDICINE