First, don't go on an empty stomach before morning exercise. When doing slow exercise, the energy of exercise mainly comes from the decomposition of fat. At this time, the free fatty acids in human blood will increase significantly. Although these free fatty acids are the main source of myocardial activity and energy. But too much accumulation will become a toxin that harms the heart muscle, especially the elderly. Therefore, you should eat a small amount of carbohydrates before morning exercise, such as drinking a cup of sugar water, milk, soy milk or malt extract, but you can't eat too much.

Second, you should not eat hot food after morning exercise. This is because, in winter morning exercise, the weather is cold, and the body has not yet eliminated the hypothermia caused by sleep. Cold air will temporarily cool the nasal cavity, trachea and adjacent pharynx and esophagus, making the body "cold adaptation". After the exercise, if you immediately swallow overheated food such as porridge, noodles and glutinous rice balls, it is easy to have symptoms such as vomiting blood and bloody stool. This is because the capillaries and slightly larger blood vessels in the esophageal mucosa and its surrounding tissues in the "cold adaptation" state can not withstand the stimulation of food, resulting in temporary adjustment obstacles, so that some blood enters the esophagus and stomach through the blood vessels and capillary walls. This situation mostly occurs in people with increased vascular fragility, especially the weak and the elderly, so these high-risk groups should be more careful.

Exercise in the morning is not as good as exercise at night. As far as people's physical condition is concerned, sleeping all night, the body is in a state of water shortage in the morning, blood is sticky, and strenuous exercise may cause dangers such as insufficient blood supply to the brain, cerebral hemorrhage and myocardial infarction. If you like morning exercises, I suggest you drink 1-2 cups of boiled water after washing, and then exercise. From the environmental point of view, some toxic gases in the air are difficult to volatilize before the sun comes out, which is not suitable for exercise. From the follow-up reaction, it is easy to eat more after exercise in the morning, but it increases the intake.