if our bodies can make us full, why does obesity exist?

Question

Shouldn’t your body just give you the stop signal and make you not overeat? Then why do people get fat at all?

In: Biology

Answer 1

Because we evolved at a time when resources were hard to come by and it was an evolutionary advantage to put on a little weight at a time of abundance. But now we live in a time of abundant access to hyper-palatable and hyper-marketed food virtually all the time and that evolutionary advantage now works against us.