Fasting works because it keeps basal metabolism high. Why? It’s a survival mechanism. Imagine you are a cave dweller in the Stone Age. It’s winter and food is scarce. If your body goes into starvation mode, you will not have the energy to go out and find food. Each day the situation will get worse and eventually you will die. The human species would have become extinct long ago if our bodies slowed down every time we didn’t eat for a few hours.
