It’s robust to outline metabolic age with out first defining basal metabolic charge (or BMR). “Your basal metabolic charge is how a lot caloric power or power from energy you could hold your physique functioning, together with the organs, digestion, muscle mass, and every thing else working over a interval of relaxation,” explains purposeful medication physician Heather Moday, M.D. “If you have been mendacity in mattress all day lengthy, it is what your physique would want or burn as a way to perform.” BMR is predicated in your gender, peak, weight, lean muscle mass—and a variety of different elements. The greater your BMR, the higher your metabolic age.