The proposition that we should drink 8 glasses of water every day is largely attributed to a report published by the Food and Nutrition Committee of the National Academy of Sciences in 1945. According to this report, for every calorie of food we eat, we need to add one milliliter of water. This means that 2,500 milliliters of liquid should be replenished every day, which is equivalent to 8 glasses of water.

A few years ago, Heinz Valtin, a kidney expert at Dartmouth Medical College, decided to conduct a study to test whether the suggestion of drinking 8 glasses of water a day was scientifically based. After reading many articles from colleagues, he came to the conclusion that:

For healthy adults who live in temperate zones and do a little exercise, there is no scientific research to support this theory of 8 glasses of water.

In fact, according to this suggestion, or taking more, "it may even be harmful, because it will not only make people suffer from potentially dangerous hyponatremia, but also expose people to pollutants. If you don't drink so much water, you will feel guilty." He wrote in a review article in the American Journal of Physiology: Management, Synthesis and Comparative Physiology.

Dr. Naoko Imai, an assistant professor of renal hypertension in the Affiliated Hospital of Santa Maria Medical University in new york, said that besides drinking water, there are also water contained in food and water produced by human body.

In this way 1 day, you don't have to drink 8 glasses of water. He suggested drinking 1 000 ~1500ml of water,1day. It doesn't matter if you only drink 500 ml of water every day for a few days occasionally. The kidney is a smart organ, which will automatically leave water in the body when there is no water; If you drink too much water, it will automatically discharge excess water. People who eat well, even if they drink 6000 ml of water a day, the excess water will be excreted by their bodies.