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

Evolution. At some point in our history our species had times when food was sparse. Those that could efficiently store calories as fat lived and those that couldn’t, starved. It’s pretty recent that many of us lived in a situation without food scarcity.