After a period of exercise, the blood is still concentrated in muscles, skin and other parts, and the gastrointestinal tract is still in a relatively ischemic state. Eating will cause blood redistribution, and the digestive system needs to mobilize blood from other parts of the body. If you eat immediately after exercise, the gastrointestinal tract and muscles will compete for blood. On the one hand, it will affect the recovery process of muscles after exercise, on the other hand, it will make the liver, pancreas and other internal organs quickly enter the digestive and secretory state after strenuous exercise metabolism, and there will be no functional interval. Eat meaty food immediately after exercise. If the blood cannot return to the digestive system for a while, a large amount of meat to be digested will cause acute gastrointestinal and pancreatic inflammation and even accidental death. Sympathetic nerves will be more excited during exercise, and the corresponding parasympathetic nerves will be inhibited. At this time, the secretion of digestive glands such as salivary glands and pancreas will decrease, and gastrointestinal peristalsis will slow down, which is not conducive to digestion and absorption in general. If you eat it right now, it will bring a great burden to the gastrointestinal tract. Therefore, let the blood and internal organs return to a quiet state after enough rest time, and then eat.