hes talking about evolution, that modern people have lost the ability to (not sure which) either utilized the body fat, or store it. something like that. either why, i don't think its true. but the scientists were talking about evolution, because humans adapt as necessary, if we need more fingers, thousands of years from now, we'll have more fingers. if we don't need to drink water, thousands of years from now, guess what, no more Aquafina