You shouldn't eat immediately after exercise for two reasons.

First, the cerebral cortex center responsible for skeletal muscle and myocardial movement is in a relatively excited state during exercise, while other parts are in a relatively inhibited state, gastrointestinal peristalsis is weakened, and digestive juice secretion is reduced.

Second, a large amount of blood is distributed in the exercise system during exercise, and the blood in the digestive system is reduced and the function is reduced. Even if you stop exercising, you will still maintain the above situation for a short time, so eating immediately after exercise will affect the digestion and absorption of food, which is not good for your health, and will also cause gastrointestinal diseases such as indigestion and chronic gastritis over time.

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Before exercise: Before exercise, it is best to eat some high-fiber biscuits, raisins or fresh fruits between 1-2 hours.

After exercise: Eat something about an hour after exercise. It is easier to accept all kinds of drinks or liquid foods after exercise, and at the same time, it can replenish water. If you haven't eaten dinner for two hours after exercise, you can eat solid food to supplement sugar and protein.

Avoid drinking caffeinated drinks such as coffee, soda and tea after exercise. Because caffeine also has diuretic effect, it will make your body's water supply insufficient. Although soda water can also provide water and sugar, it is not a suitable post-exercise drink.

Be careful not to do strenuous activities immediately after meals, and avoid eating immediately after strenuous exercise. Rest for 30-60 minutes and you can eat. Food should be light and nutritious. Don't eat food that is too cold, too hard or too greasy.

When exercising and keeping fit, the time for eating is very particular. It is not advisable to engage in strenuous exercise before and after meals, and there should be a certain interval between exercise and eating. During exercise, in order to ensure the oxygen supply of musculoskeletal oxygen and nutrients, the whole body blood is redistributed under the regulation of the central nervous system, which greatly reduces the secretion of digestive glands, thus affecting the digestion and absorption of gastrointestinal tract. The more intense and lasting the exercise, the longer it takes for the digestive organs to recover, so it is a normal physiological activity for people not to eat immediately after exercise.

It is generally believed that it is more scientific to rest for at least 30 ~ 40 minutes after exercise. Similarly, you can't take part in strenuous exercise immediately after meals. If you take strenuous exercise immediately after a meal, the blood that is participating in gastrointestinal digestion will be redistributed and flow to muscles and bones, which will affect gastrointestinal digestion and absorption. Taking part in strenuous exercise immediately after meals will also cause abdominal pain and discomfort due to gastrointestinal vibration and mesentery involvement, which will affect human health. So you can exercise at least after meals 1.5 hours. Less strenuous activities after meals, such as walking and mild cultural and sports activities, are not only helpful for digestion, but also beneficial to health.