Researchers from Harvard: how much water people need to drink a day
Drinking water is water that is designed for daily unlimited and safe consumption by humans and other living beings. The main difference from table and mineral waters is the reduced content of salts (dry residue), as well as the existence of existing standards for the overall composition and properties (SanPiN 126.96.36.1994-01 - for centralized water supply systems and SanPiN 188.8.131.526-02 - for waters packaged in the capacity).
The water of many sources of fresh water is unfit for human consumption, since it can serve as a source of disease spread or cause long-term health problems if it does not meet certain water quality standards.
Water that does not harm human health and meets the requirements of the current quality standards is called drinking water. In case of need, that the water corresponds to the sanitary-epidemiological norms, it is cleaned or, officially, "prepared" with the help of water treatment plants.
It is noted that earlier in the media there were theories that a person should drink at least two liters of water per day, not counting other fluids.
However, it turned out that this is just a myth, but a person in fact can drink less, it depends on the conditions in which he is. In the usual way of life and conditions, it is enough to drink 4-6 glasses of water to maintain the water-salt balance.
Scientists say that the amount of fluid consumed can increase in summer, as well as during training. In general, they note that these are individual data that will differ even on different days for one person.
Daily consumption of 1-2 liters of water is necessary for normal physiological activity of the human body, depending on the surrounding weather conditions and diet (in particular, salt consumption). The absolute minimum for a long period is about 1.6 liters (600 ml per urine, 200 ml for fecal losses and 800 ml for losses through the skin and lungs). This includes water contained in food (that is, it does not take 1-2 liters of water a day to survive, although it is often recommended for health benefits).
The sensation caused by the dehydration of the body is called "thirst". Thirst is a feeling of dryness on the back of the tongue and a strong desire to drink. Thirst is regulated by the hypothalamus in response to weak changes in the electrolyte level of the body as a result of changes in the volume of circulating blood.
In the summer any fruit juice is useful. Apple juice breaks down fats, it is also useful to people suffering from gastrointestinal diseases. Also many useful substances contain and tomato juice. Juice is also useful for children. Nectar is a drink consisting of one or several juices.
Via eizvestia.com & wiki & wikihow