What is the relationship between water and human health?

Water is an important part of human body and one of the seven nutrients, which plays an important role in human health. Nutritionists believe that on earth, water is the source of life, and all living things can't live without water. Without water, there is no life. As a human being with advanced intelligence, all parts of the material life system are composed of water as the main material, just like other life forms. Take human body as an example, water accounts for 65% ~ 70% of human body weight. In human eyes, water accounts for 92%, blood is more than 90% water, brain, lungs, kidneys and other internal organs are more than 80% water, and muscles are more than 70% water. Even the water content of bones is 12% ~ 20%. Someone once did an experiment. One dog died on 12 day without water, and the other dog lived for 25 days without water. Humans have also proved in countless experiments and observations that people can not eat any food for a period of time under the condition of ensuring normal drinking and sleeping activities. The scientific name is Bi Gu (Bi means exclusion, and Gu means five grains). When people break the valley, they should drink water and sleep, so that they can persist. Scientific research has also proved that if people are not allowed to drink water, their life span can be as long as 1 week. This shows how important water is to life!