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Are We Relying Too Much on BMI to Diagnose Obesity?


 

Gary* is a 60-year-old race car driver with a history of insulin resistance, elevated cholesterol, and severe reflux. His wife sent him to me when his snoring became so loud and “violent” that she could no longer sleep in the same bedroom.

She was desperate to help him lose weight in a sustained fashion. All his previous efforts were short-lived due to his self-described pizza and burger addiction. At 5 ft 9 in and 180 lb, his body mass index (BMI) was approximately 26.5 (normal is 18.5-24.9).

On exam, his arms and legs were relatively thin, but he had a hard, protuberant belly. Given his body habits, comorbidities, and family history of early heart disease, I was worried that his weight would eventually become life-threatening. Solely on the basis of BMI criteria, however, he is not considered to be at high risk.

This begs the question, are we relying too much on BMI and ignoring central adiposity (ie, belly fat) and comorbid conditions when identifying at-risk patients?

The European Association for the Study of Obesity (EASO) argues exactly this point in its new guidelines published in July 2024. Titled “A New Framework for the Diagnosis, Staging, and Management of Obesity in Adults,” the guidelines assert that obesity should be redefined as a chronic and relapsing adiposity-based disease which may start off as asymptomatic but often becomes life-threatening.

The guidelines further argue that BMI does not appropriately predict cardiometabolic risk in patients with BMI < 35. Instead, in such patients we should incorporate the use of waist-to-height ratios to reflect the potentially deleterious presence of increased visceral fat. It expands the definition of high-risk patients to include those with BMI > 25 and a waist-to-height ratio > 0.5.

It also suggests that DEXA (dual-energy x-ray absorptiometry) or bioimpedance testing be used when BMI results are ambiguous. The European guidelines recommend considering screening more routinely for eating disorders (with psychometric testing) and depression. The guidelines highlight the importance of long-term goals and of physical activity, nutrition, and psychological support in addition to pharmaceutical treatments.

On the basis of these new guidelines, I attempted to start Gary on Wegovy (semaglutide) along with sending him to a health coach, dietitian, and trainer. Unfortunately, despite documenting a waist-to-height ratio of > 0.6 and elevated fat percentage of just over 30% using bioimpedance, my prior authorization and appeal were summarily rejected by his insurance provider.

In the United States, pharmacotherapy is typically approved for patients with a BMI of 27 or higher with a comorbidity (like high blood pressure or elevated cholesterol levels) or a BMI over 30. This clearly highlights the need for updated criteria for weight loss medication. Thank goodness for compounded semaglutide to fill this void until the medical world catches up with the EASO guidelines.

Now on compounded semaglutide, Gary has lost 15 lb. His once rounded belly is nearly flat, and he has a normal waist-to-height ratio. While his dietary choices still leave something to be desired, his portion sizes are much smaller. His snoring has improved considerably. His most recent bioimpedance testing showed a reduced fat percentage of just under 25%.

*Patient’s name has been changed

Caroline Messer, MD, is Clinical Assistant Professor, Mount Sinai School of Medicine, and Associate Professor, Hofstra School of Medicine, both in New York. She has disclosed no relevant financial relationships.

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

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