It is best to exercise for about 3 hours after a meal, because the pressure on the stomach is relatively high just after eating. If you exercise immediately, it is harmful to your stomach. You can't eat until about 2 hours after exercise. At this time, your body's metabolism is basically stable, which is conducive to the absorption of food.
After strenuous exercise, the human body will consume a lot of nutrients and need to be supplemented in time, but it should be reminded here that it is not good for the body to eat immediately after strenuous exercise.
If you take strenuous exercise after meals, the blood that is participating in gastrointestinal digestion will be redistributed and flow to muscles and bones, which will affect gastrointestinal digestion and absorption. It will also cause abdominal pain and discomfort due to gastrointestinal vibration and mesentery involvement, which will affect human health.
You'd better eat some high-fiber biscuits, buns, raisins or fresh fruit between/kloc-0 and 2 hours before exercise. 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 can also provide water and sugar, it contains carbon dioxide and so on, so it is not a suitable drink after exercise.