Water is the source of life and is an important component of the human body. Water accounts for about 60% of the body weight of healthy adults, of which, intracellular fluid accounts for about 40%, constitute the human body environment of extracellular fluid accounts for about 20%, specifically, 80% of the blood, 70% – 80% of internal organs, 10% – 40% of the bones are composed of water, which shows the importance of water to the human body: 1, water constitutes the intracellular medium, participate in intracellular biochemical reactions, or provide reaction medium for biochemical reactions. 2, through the skin, lungs, kidneys to regulate water, electrolytes, acid-base balance, regulate body temperature, maintain a relatively stable body temperature. 3.Transport nutrients absorbed by the gastrointestinal tract to individual cells, while transporting metabolites produced by the liver, kidneys and other organs to the kidneys for excretion. 4.Small amounts of fluid in body cavities such as pleural cavity, pericardium and joint cavity can lubricate tissues and joints. So, where does the water in the human body come from and where does it go? The human body needs an average of about 2500ml of water per day, mainly from three sources: drinking water of about 1200ml, about 50%. From food 1000ml, or about 40%. Protein, sugar and fat metabolism can supply 300ml of water, accounting for about 10%. Drinking in water and excreted water are basically equal about 2500ml, in a dynamic balance. The excretion of water in the body is mainly through the kidneys, in the form of urine, accounting for about 60% (about 1500ml), through the lungs about 14% (about 350ml), through the skin evaporation and sweating about 20% (about 500ml), with the feces about 6% (about 150ml). If the body does not replenish sufficient water, water shortage will have what effect on the human body? Let’s look at a set of data: 1, water loss up to 2% of body weight, can appear heavy thirst, mild discomfort, urine volume decreased. 2, water loss up to 10% of body weight, can appear irritability, general weakness, body temperature, blood pressure drop, skin loss of elasticity. 3.Water loss up to 20% of body weight can cause death. In fact, before the appearance of the above symptoms, the body will send us a series of signals, such as feeling thirsty, headache, back pain, joint pain, muscle pain, strong smell of urine, yellow color, constipation, if we ignore, and let it progress, the results can be imagined. So, is it better to drink more water? The answer is no, drinking too much water can also cause a series of symptoms and discomfort, such as fatigue, reduced appetite, dizziness, nausea, and even aggravate the original disease, especially poor heart function and chronic kidney disease patients. So, how much water is appropriate for people to drink every day? The Dietary Guidelines for Chinese Residents 2007 recommends that lightly active adults living in mild climates should drink at least 1200ml of water per day, about 6 cups! Of course, the human body’s need for water is affected by age, physical activity, environmental temperature and other factors, and varies greatly, the specific amount of water should be determined on a case-by-case basis, and can not be generalized. I think, we must also be more concerned about another issue: what water is most suitable for drinking? Boiled water! There is no doubt about it! Boiled water is the most suitable for human needs of drinking water, has the following advantages: the heating process to remove bacteria and harmful organic compounds. The process of heating removes bacteria and harmful organic compounds, improves the quality of water that is too hard, and keeps certain minerals in the original water from being lost. The preparation is simple, economical and easy to use. However, it is important to note that the water boiled on the same day to drink the same day! Naturally cooled, placed no more than 6 hours of boiled water is the most beneficial to health. General principle: a small amount of time each time about 200ml,. Wake up in the morning on an empty stomach. Always have water with you so that you can drink at any time. Do not feel thirsty before drinking water. Drink the first glass of water in the morning after waking up on an empty stomach to replenish the amount lost in sleep. Drink water in the middle of the day to replenish the water lost by evaporation that can be felt and not felt during working hours. Drink a glass of water before going to bed to help prevent increased blood viscosity at night. Drink water after waking up in the middle of the night to prevent cerebrovascular lesions. Half a glass of water before meals can help digestion. Timely replenishment of sufficient water after exercise to relieve fatigue. The elderly before and after bathing it is best to drink a glass of water to prevent accidents. Tea culture has a long history in China, the Chinese have had the habit of drinking tea since ancient times, tea contains tea polyphenols, caffeine, tea polysaccharides, etc., these substances can make the blood vessels to maintain elasticity, but also to eliminate arterial vascular spasm, to prevent blood vessel rupture, therefore, often drink tea in moderation is beneficial to health, but, fasting, before bed, iron deficiency anemia should not drink strong tea. Finally, I have to mention the issue of beverages. About drinks, there are three points to emphasize: you can not drink drinks as water. Drinking fruit juice is not a substitute for eating fruit. A calorie-restricted diet must limit beverages, especially sugary ones. Among the many types of beverages, sports drinks, known for their vitamin and nutrient content, are a good choice!