After fasting exercise, you can usually eat in about half an hour, but if there are symptoms of hypoglycemia, it is recommended to eat sugary foods immediately. During exercise, the blood circulation of the whole body is mainly concentrated in the muscle tissue, after stopping exercise, the blood needs some time to redistribute, at this time, the blood supply of the digestive tract is less, so it is recommended to eat after fasting exercise for about thirty minutes, at this time, the whole body’s blood has been redistributed, the digestive system has a sufficient supply of blood flow, which will help digestion and absorption of food. It should be noted that fasting exercise process will increase the decomposition of glucose, there may be hunger, fatigue, cold sweat and other hypoglycemic symptoms, once the symptoms of hypoglycemia need to eat sugary foods immediately; diabetic patients, especially diabetic patients with unstable glucose control is not recommended to exercise on an empty stomach, it is easy to have hypoglycemia.