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

Through most of human history and that of our evolutionary ancestry, storing energy was beneficial to survival since food was more difficult to come by. As a result, we evolved to store excess calories for future energy. But now we live in a society of abundance where it is not as useful.