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Air Pollution, Insulin Resistance, and BMI
In April 2025, JAMA Network Open published the results of a unique long-term cohort study (Meta-Air2) designed to unravel the connections between air pollution, insulin resistance, and body mass index (BMI). Traffic-related air pollutants (TRAP) have previously been associated with an increase in risk for type 2 diabetes, but the mechanism has not been entirely…
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Waist-to-Hip Ratio vs BMI
Numerous studies indicate that, compared to body mass index (BMI) or total body fat, waist-to-hip and waist-to-height ratios show stronger associations with risk for cardiometabolic disease and all-cause mortality. A paper published recently in JAMA Network Open Diabetes and Endocrinology showed that compared to BMI and fat mass index (FMI), the waist-to-hip ratio (WHR) showed…
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BMI & the Vitamin D Response
Results of a cohort study were recently published in JAMA Network, with the potential to profoundly affect our understanding of vitamin D supplementation. Despite extensive epidemiological data implicating low vitamin D status as a risk factor for many chronic diseases, controlled trials of supplementation have not always been as encouraging. This trial may help to…