Water is an essential nutrient for human beings every day. Experiments have shown that a person can survive for dozens of days without eating but only drinking water. However, a person cannot survive without drinking water for several days. This shows that water is very important to human health. Healthy adults need about 2500 ml of water every day, so to stay healthy, you must pay attention to taking in enough water every day. At the same time, we must pay attention to science and hygiene when drinking water.

(1) Do not drink contaminated raw water: 80% of human infectious diseases are related to water or water source pollution. Diseases such as typhoid, cholera, dysentery, and infectious hepatitis can all be caused by drinking contaminated water. Contaminated water can also cause the spread of parasitic diseases and endemic diseases. Therefore, drinking water must meet hygienic requirements. Don't drink raw water, drink boiled water.

(2) Drink water with appropriate hardness: water hardness refers to the content of salts dissolved in the water. If the water contains more calcium salts and magnesium salts, the water will have greater hardness, and vice versa. Excessive water quality affects the digestion and absorption function of the gastrointestinal tract, causing gastrointestinal dysfunction, causing indigestion and diarrhea. Our country stipulates that the total hardness of water should not exceed 25 degrees. It is recommended that the appropriate hardness of general drinking water is 10-20 degrees. The best way to deal with hard water is to boil it. After boiling, the appropriate hardness can be achieved.

(3) Drink water in moderation. Summer temperatures are high and people sweat more and become thirsty. But drink an appropriate amount of water at one time and don’t drink a lot of water. Even if you are very thirsty, you cannot drink too much water at one time. This is because after the water you drink is absorbed into the blood, the blood volume will increase, and a large amount of water entering the blood circulation will increase the burden on the heart. Pay attention to drinking it several times appropriately.

(4) Drink water in the right amount at the right time. Drinking a glass of water after getting up in the morning can clear the stomach and intestines, reduce blood concentration, and prevent thrombosis. It is not advisable to drink a lot of water immediately after strenuous exercise or sweating. After a meal, the digestive juices are digesting food. If you drink a lot of water at this time, it will dilute the gastric juice and gastric acid and affect the digestive function.

1． You can drink water before going to bed at night.

2． Drink more water in summer and winter,

3. When you have a fever, be sure to drink water. Also, when flying on a plane, it's best to nod when the stewardess asks you if you want some water.

4. After sweating a lot during physical labor, adding an appropriate amount of salt to drinking water can maintain the normal salt content in the body.

Although tap water has been disinfected and filtered, it still contains certain bacteria. The overnight boiling time is long and the temperature is around 37°C, which is very suitable for the growth and reproduction of bacteria. At the same time, the extremely low nitrite content in the water is greatly increased. When people drink this kind of water with high nitrite content, it will directly affect the oxygen-carrying function of the blood. In severe cases, the human body will suffocate due to lack of oxygen. Nitrite has another more dangerous potential toxicity: it can combine with amines in the human stomach to synthesize nitrosamines. Nitrosamines are a recognized strong carcinogen. Therefore, you cannot drink water that has been boiled overnight.

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