Forget about 8 glasses. Scientists have named the ideal amount of water a person needs per day
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Research shows that previous recommendations were too high.
Previous research has been based on surveys of small groups of people. However, in the new study, just over 90 scientists from different parts of the world have combined their efforts. They all collaborated to measure the turnover of water in the human body using a new method.
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In total, more than 5.5 thousand people aged from 8 days to 96 years from more than two dozen countries took part in the study. During the study, participants were required to drink a measured amount of water enriched with deuterium, which is naturally present in the human body and does not pose a threat. After that, the researchers measured the rate at which deuterium disappears from the body, that is, in fact, they measured the speed of the water cycle process in the human body.
The analysis shows that people living in hotter and more humid regions and higher altitudes, as well as athletes, pregnant and lactating women need more water due to the fact that the rate of its turnover in the body is higher.
According to study co-author Professor John Speakman of the University of Aberdeen, it's important to remember that water turnover is not at all equal to the need for drinking water – the fact is that most foods also contain water. As a result, a significant amount of water is provided only by food. For example, a man in his 20s has a water turnover of about 4.2 liters per day, but he does not need to drink the same amount of water per day at all – about 3.6 liters of water will be enough.
Results research shows that the common belief that we all need to drink 8 glasses of water a day is too high for most. New calculations show that the average middle-aged man needs to drink 1.6-1.8 liters of water per day, a woman – 1.3-1.4. At the same time, people aged 80 years will need up to 1.1 liters of water per day.
Researchers note that the amount of water depends largely on what kind of food we eat. In addition, the daily amount of water per day should also include coffee, tea, juices and other drinks that we consume.
According to study co-author Dale Scholler of the University of Wisconsin-Madison, this study is the most extensive and the most accurate of all previously conducted. The researchers concluded that drinking 8 glasses of water a day is most likely not to harm the human body, but it will not bring benefits either.