"In our daily life, water is too common. But perhaps because of this, most people don't know how to drink water, what water to drink and when to drink water every day ... and this directly affects our health. " Today, experts answer several "drinking water problems" which are closely related to health and are also the most concerned by the people. What nutrition is there in the water? What's the difference between boiled water, pure water and mineral water? Expert: There are indeed many people who care about whether there are various nutrients in water, but they ignore the most fundamental fact-water itself is a nutrient. We usually say that the human body needs six kinds of nutrients, which are actually carbohydrates, fats, protein, vitamins, minerals and water. Water is a living body and an indispensable nutrient for the survival of animals and plants. At the same time, water is also the most abundant component in human body. As long as there is enough drinking water, people can survive for weeks without food; But if there is no water, people will die every day. Therefore, whether you like drinking boiled water, tea or soup, you should take enough "water and nutrition" every day to keep the complex machine of the human body running normally. Is boiled water the best way to replenish water? Expert: This statement is somewhat one-sided. The hydration effect of boiled water is really good, but it may make people feel "bad" because of its single taste. Studies have shown that people usually consume more water when drinking their favorite drinks. The latest edition of Dietary Guide for China Residents by China Nutrition Society also points out that the water content of most drinks on the market now exceeds 80%. The main function of the beverage is to supplement the water needed by the human body, and at the same time bring consumers a pleasant taste experience. However, many drinks contain a certain amount of calories, which will increase the calorie intake while replenishing water. Therefore, when drinking cola and other beverages, we must control the amount. Besides boiled water, a glass of milk in the morning and a glass of juice between meals are also good choices. What is the difference between boiled water, purified water and mineral water in nutrition? Expert: In terms of composition, both boiled water and mineral water contain minerals, and pure water is pure water. In the north of China, thick scale will be formed on the inner wall of the boiling pot, which is the manifestation of the existence of minerals. In this sense, boiled water is also a kind of mineral water. So, is water with minerals better than water without minerals? Not necessarily, after all, the mineral content in water is very small, which will not have a great impact on the supplement of minerals needed by the human body. Therefore, it is wrong to say that drinking mineral water for a long time will lead to excessive mineral intake or even poisoning, and it is also wrong to say that drinking pure water for a long time will lead to nutritional deficiency. Can I replenish water when I drink soup? Expert: Of course, because more than 90% of soup is water, which is a good way to replenish water. However, the soup we drink should not be too salty, otherwise too much sodium ion will change the osmotic pressure in the body, and we must drink more water to neutralize it-that's why we sometimes feel more thirsty when we drink soup. Therefore, when cooking soup, we must control the amount of salt. Chicken mushroom soup is delicious, so you can add no salt. Can I drink water for the night? Expert: Some microorganisms may breed overnight in water, but it is not that serious to say how harmful it is to human body. As long as it is not polluted, the nature of water will not change, so it is no problem to drink water overnight. The spring water we drink is probably more than 100 thousand years ago. Can I drink boiled water repeatedly? Expert: Some people call this kind of water boiled water, which refers to the water repeatedly heated in a drinking machine or kettle. Generally speaking, the content of nitrite in this water will be higher. A large amount of nitrite can directly poison people, because nitrite reacts with human blood to produce methemoglobin, which makes blood lose its oxygen-carrying function and makes people suffer from hypoxia poisoning. Although the content of nitrite in boiled water is not so high, when nitrite reaches a certain dose in human body, it has carcinogenic, teratogenic and mutagenic effects, which can seriously endanger human health. Therefore, try not to boil water repeatedly. It is also best to "burn hot water as you drink it" in the water dispenser, and don't keep it in a state of "heating-insulation" all the time.