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Fat mass index, not BMI, associated with cardiovascular events in people with diabetes

September 23, 2019

In people with diabetes, fat mass index, not body mass index (BMI), is associated with a higher risk of cardiovascular events, according to new research in CMAJ (Canadian Medical Association Journal).

Heart disease is a major cause of death worldwide, and obesity is a major risk factor. Body mass index, a common measure of obesity, has been recently shown to be an imperfect metric because it does not distinguish between lean muscle mass and fat mass. When issues related to obesity are studied, suitable metrics that describe obesity accurately are extremely important.

Researchers analyzed data on 10 251 adults from the ACCORD study, a randomized controlled trial in the United States looking at diabetes and cardiovascular disease (CVD). The mean age was almost 63 years, and 62% of participants were men. The researchers found that people with type 2 diabetes and higher fat mass were at increased risk of major cardiovascular events compared to people with lower fat mass. In contrast to previous research, the protective role of lean body mass was not observed in the research population with type 2 diabetes as a whole.

"We found that the protective effect of lean body mass was observed in participants with a lean BMI of less than 16.7 kg/m2," writes Dr. Xinqun Hu, Departments of Cardiovascular Medicine and Emergency Medicine, The Second Xiangya Hospital, Changsha, Hunan, China, with coauthors. "The increased risk of CVD in [type 2 diabetes mellitis] patients with lower BMI may be attributed to the adverse effect of lower lean body mass that overrides the positive effect of lower fat mass."
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"Association of Predicted Lean Body Mass and Fat Mass with Cardiovascular Events in Patients with Type 2 Diabetes Mellitus" is published September 23, 2019.

Canadian Medical Association Journal

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