Fasting blood glucose will generally rise temporarily after exercise in the morning, and then will fall, generally not recommended to exercise on an empty stomach in the morning. Fasting blood glucose will be temporarily elevated, because in the process of exercise sympathetic nerve excitation, the body will produce adrenaline, glucagon and other hormones that cause the body’s blood glucose rise. Therefore, in the morning after fasting exercise blood glucose will first be temporarily elevated. However, the fasting blood glucose will drop after the elevation, because the elevation of blood glucose after fasting exercise belongs to the stress change, normal people’s pancreatic β-cell function is normal, will secrete insulin, so that the blood glucose will drop. Therefore, after fasting exercise for a period of time, blood glucose will drop, and even some patients will experience hypoglycemia. In order to avoid hypoglycemia in early morning exercise, it is generally not recommended to exercise on an empty stomach, and can be exercised 1 hour after meals. If patients experience hypoglycemia during exercise, go to the hospital in time.