In general, you can eat only after half an hour after running, and you should not drink a lot of cold water immediately after running. After running, most of the blood is concentrated in the limbs, and the blood in the digestive tract will be reduced, while the metabolism of skeletal muscle will produce lactic acid factor, so eating immediately after running will affect the digestion and absorption of food, and also easily cause stomach discomfort. Generally, lactic acid in the body can be metabolized after 30 minutes of running, and the blood can be concentrated in the gastrointestinal tract to help digestion and absorption. In addition, 30 minutes after running to eat does not make the stomach acid secretion too much, also not easy to cause stomach discomfort. In addition, if the amount of exercise, sweating more, 30 minutes after running can be appropriate first drink water, then you can add a small amount of salt and sugar in plain water to supplement the body’s lost salt and energy.