Human uses of water
About 72% of the fat free mass of the human body is made of water. To function properly the body requires between one and seven litres of water per day to avoid dehydration, the precise amount depending on the level of activity, temperature, humidity, and other factors.
However, most of this is ingested through other foods or beverages (hot tea being often used in deserts to avoid dehydration, etc). It is not clear how much water intake is needed by healthy people.
However, for those who do not have kidney problems, it is rather difficult to drink too much water, but (especially in warm humid weather and while exercising) dangerous to drink too little. People can drink far more water than necessary while exercising, however, putting them at risk of water intoxication, which can be fatal.
The “fact” that a person should consume eight glasses of water per day cannot be traced back to a scientific source. There are other myths such as the effect of water on weight loss and constipation that have been dispelled.
Ainda conforme o texto, a quantidade de ingestão diária de água
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