Is it scientific to say that you must drink eight glasses of water every day?

The late nutritionist stahle suggested drinking eight glasses of water a day as early as 1940. He claims that everyone drinks eight glasses of water every day, and good skin is good for health. It is for this reason that most female friends are willing to fall into this scam. There is another serious misunderstanding. The Cup here is the English word cup. This cup is just a measuring tool in Europe and America, that is, the size of the cup you carry in the rice cooker or rice cooker. I don't know whether the British or the Americans changed the meaning of the cup and said it was a glass cup.

Today, the new research results of American scientists point out that drinking 8 glasses of water is good for health, which is purely "nonsense", just a rumor and has no scientific basis. They even accused him that drinking plenty of water not only failed to achieve the effect of beauty beauty, but also weakened the detoxification function of the kidneys. Severe cases may even lead to water poisoning. You know, drinking too much water is a burden to the liver and kidneys, which seriously affects your health. The real principle of drinking water should be to drink water only when you are thirsty. Drink less at a time, and then drink when you are thirsty.

Drinking a lot of water suddenly can lead to water poisoning, and in severe cases, it can lead to death. The day before yesterday, Miss H didn't drink water because she had to have a long regular meeting at work. After the meeting, she was thirsty and had a few drinks. 15 minutes later, symptoms such as stomach pain and vomiting began to appear. After being rushed to the hospital, she was diagnosed as "water poisoning". The citizens can't help asking: they didn't drink any polluted water, nor did they drink it indiscriminately on hot and cold days. At most, it's a cold and stomachache. How can they be poisoned?

Water poisoning refers to a pathological phenomenon, that is, the intake of water exceeds the human body's ability to replace water, which leads to the retention of water in the body, the decrease of blood osmotic pressure and the increase of circulating blood volume. The human body will suddenly replenish a lot of water after sweating a lot for a long time and losing salt, but it can't replenish salt in time. The decrease of salt in blood leads to the decrease of water absorption capacity. Excessive water is absorbed by tissues and cells, forming cell edema, leading to "water poisoning", causing stomach pain, dizziness, vomiting, unstable heartbeat and so on. In severe cases, the patient is unconscious, and in extreme cases, he may die.