Eli5:Why we get hungry after a while and why our body doesnt just use our stored fat?

Question

And after how many hours or days our bodies use our stored fat?

In: Biology

Answer 1

Humans evolved in conditions where food was not always available. And what food was available usually had few calories. So we evolved to eat as much high calorie food as possible whenever it was available. Our body’s default assumption is that we are about to be starving for a long period of time so we better stock up while we can.