Fat Healthy Diet

Were people who need to exercise more(to keep slim) better off in the wild hundreds of thousands of years ago?

spacebendingguy asked: Please don’t answer this question if you cannot answer it logically.
I notice some people need to exercise a lot more than others to keep slim.
Thousands of years ago, when food was scarce and everything was about manpower (hunting, running away from predators, farming), if you were equal to a skinny person [...]