We must look at evolution outside just the human race, for the development of mechanisms for fasting. Humans evolved from many species, and regardless of how modern humans have farmed and stored food for winter over many thousands of years, we were once animals living off the land and during Winter there were periods of time where there was little to no food.

This is a very clever mechanism, if you look at it. During long fasting, the body repairs itself and gets ready for Springtime activities.

My opinions here are based on logic and personal experience, which may differ somewhat from the official biological narrative.

robert