1, from the function of the brain, after drinking a lot of water, the human body is prone to fatigue, appetite is greatly reduced, and the head feels groggy. The doctor pointed out that this is because drinking too much water dilutes the blood and the oxygen exchange of cells in the whole body will be affected. Once brain cells are deprived of oxygen, people will become dull.

2. Excessive water intake will increase the burden on the heart and kidneys, so people with heart disease, hypertension, kidney disease and edema should not drink too much at a time, nor should they drink too much at a time after sweating heavily due to labor or exercise.

3. Excessive drinking will lead to excessive salt loss in the human body, and some water will be absorbed by tissues and cells, causing cell edema. At first, there will be dizziness, weakness, rapid heartbeat and other symptoms. In severe cases, convulsions, confusion and coma may even occur, that is, water poisoning.

4. At night, because of fear of nocturia, it is necessary to appropriately reduce the burden on the kidneys; When people are hungry before meals, because there is gastric acid secretion, drinking too much will affect the concentration and digestion of attention.

5, drinking too much water, so that the blood volume increases sharply, the burden on the working heart increases, and it needs strong contraction to compensate. The kidneys excrete more water in a short time, which will also consume energy. If you work repeatedly, your heart and kidneys will be "tired" and your function will decline.