At least 30-40 minutes should be interval after exercise before eating, usually not recommended to eat immediately after exercise, because just after exercise blood are working, naturally will reduce the blood supply in the gastrointestinal tract. If the blood supply to the gastrointestinal tract is reduced, meals will not be effectively absorbed and digested, will reduce the uptake and utilization of nutrients in food, so at least 30-40 minutes between meals after exercise. When the blood vessels supplying the skeletal muscles throughout the body have all been diaped and blood redistributed in the joints, tissues and organs of the limbs, only then can you eat. Let the blood supply in the gastrointestinal tract increase, facilitating the digestion and absorption of food.