Eli5:What prevents our bodies to get rid of excess food/calories that are not necessary, and instead turns it into fat?

Question

Eli5:What prevents our bodies to get rid of excess food/calories that are not necessary, and instead turns it into fat?

In: 55

Answer 1

A few billion years of evolution, during which starvation was a very real danger, and food was often available infrequently, but in large amounts.
Every single one of your ancestors managed to NOT STARVE (at least not before reproducing), often by stuffing themselves on the rare occasions when they could, so they could survive the other 90% of the time when there wasn’t much food available.