During hunger or starvation, the body reacts to periods of
low energy intake by burning and draining different energy substrates. During short
times of hunger or energy abstinence, the body burns fatty acids from body fat
stores, and utilizes glycogen that are stored in liver cells. However, during extreme
cases of starvation, the body runs out of fat, which results to the body using
proteins and burning muscle tissue as an energy source.
