While body mass index (BMI) is regularly used to gauge fitness and health, it is a relatively simple measure with serious limitations, labeling people as overweight even as they get in shape and gain muscle mass.
NewsNation’s Anna Kooiman sits down with Dr. Gabrielle Lyons, who literally wrote the book on muscle and longevity for women, to dig into the origins of BMI and alternatives that can be better for tracking progress — and for your sanity.