It is generally recommended to eat after about 30 minutes of exercise on an empty stomach in the morning, and fasting is not recommended for people at risk of hypoglycemia. Due to the exercise process, the blood in the body is mainly used to supply the skeletal muscle tissue, in just stop exercising when the supply of blood to the gastrointestinal tract is less, eating may lead to digestive dysfunction, abdominal distension, abdominal pain and other discomforts, generally about 30 minutes after the end of the exercise can be eaten. Pay attention to eating in moderation, can not eat too much to cause gastrointestinal burden. Avoid spicy and stimulating, too cold and too hot food, so as not to irritate the mucosa of the gastrointestinal tract and produce discomfort. For diabetic patients, poor physical condition of the elderly and other people, it is not recommended to exercise on an empty stomach to prevent the occurrence of hypoglycemia and other adverse reactions.