Food after exercise is important because it replenishes glycogen stores and begins healing muscle damage. In fact, recovery from exercise does not take place until food is introduced. This process ensures the active person can return to exercise faster and prevent injuries. Carbohydrates help bring muscle glycogen stores back to pre-workout levels, which is important for keeping blood sugar stable and fueling the energy-making process. Protein within two hours of exercise is important for stimulating muscle protein synthesis and repairing muscles, joints, and tendons.