Big changes for BMI

Recent medical guidance is reshaping how we define obesity and body health, moving beyond the traditional Body Mass Index, or BMI. A global commission published in The Lancet Diabetes & Endocrinology now argues that BMI alone is too limited because it doesn’t account for body fat distribution, muscle mass, or overall health impact. The updated framework introduces new categories like “clinical obesity” and “pre-clinical obesity,” combining BMI with measures such as waist circumference, waist-to-hip ratio, and evidence of organ or metabolic dysfunction. In this episode, we unpack what the new definition means, why experts say BMI has been overused for decades, and how this shift could change healthcare, diagnosis, stigma, and treatment worldwide.