A recommendation to drink eight glasses of water a day is likely to be excessive for most people, according to scientists.. The latest work, however, the most rigorous study to date on water turnover, reveals that people have a wide range of water intakes. Many people only require about 1.5 to 1.8 litres a day, lower than the two litres typically recommended, the research suggests.
One issue is that previous estimates of water requirements have tended to ignore the water content of food, which can contribute a substantial proportion of our overall intake. The rate of elimination of the extra deuterium reveals how quickly water in the body is turned over, and the study found the measure varied widely depending on a person’s age, gender, activity levels and surrounding. Those living in hot and humid climates and at high altitudes as well as athletes and pregnant and breastfeeding women had higher turnover, meaning they need to drink more water.
That's probably why so many people have high blood pressure.
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