In fact, the foods we eat every day contain a lot of water. For example, most vegetables and fruits are more than 90% water, while eggs and fish also contain about 75% water. It is roughly estimated that we can get at least 300 ~ 400 ml of water from food or soup when we eat a meal. Therefore, after deducting1000 ~1200ml of water ingested by food in three meals, we only need to drink1000 ~1200ml of boiled water every day, with an average of 2 cups in the morning and 2 cups in the afternoon.
However, the water demand must depend on everyone's environment (temperature, humidity), exercise, health and food intake, etc. There is no standard value. People should not drink less than 500ml of water a day, but not more than 3000ml.
However, some people do need to drink more water, including gout and kidney calculi patients. The insurance method is to follow the doctor's advice.
There are three methods to estimate the daily water demand of human body, but the conclusion is basically the same: the average daily water demand of adults is more than 2500 ml, of which about1500 ~ 2000 ml comes from direct drinking water and the rest is taken from food. For a 70-year-old man, he will drink more than 60 tons of water in his life. Of course, adding more than 2000 ml of water a day is only an average.
For a single individual, we can measure our real water consumption in the following ways.
The first calculation method of drinking water can be calculated according to weight. According to the research of the International Institute of Medicine in Los Angeles, the standard of drinking water for adults every day is: 40 ml of water should be added per kilogram of body weight every day.