Protein is the last energy source of the body.
The way with which the body uses energy is to burn carbohydrates first as an
immediate supply; then fats are burned to accommodate the demand for more
energy in prolonged activities; while protein is the last resort of energy of
the body. Proteins can only be used up by the body when there are no more
calories to be burned and the energy stores have also been depleted. Food
deprivation and starvation could cause the body to use up protein as its final
survival method.
