Yes, it is true – the myth, “You should drink 8 glasses of water each day” has been around for years. There is simply no science behind this “claim.”
Each and every summer there are warnings out that people need to drink water to maintain their hydration. Numerous people believe that this myth was found during a Food and Nutrition Board recommendation in 1945 and it said that people should be consuming 2.5 liters of water each day. However, they ignored the following sentence that stated, “Most of that water is found in prepared foods.”
Water can be found in vegetables and fruits. Water is also in coffee, tea, beer, and juice. There is also a myth that coffee can dehydrate you – that’s not even true either. There is no scientific research that proves it is.
There is no denying that drinking water is the best option for you and the most healthiest beverage, but there is just not enough proof that drinking extra water will be beneficial. Many people believe that their skin will look wrinkle free or healthier by drinking water, but there is nothing to back that claim up either.
There is no evidence when it comes to benefits for kidney function either. There are some specific cases where an individual experiences true dehydration due to the body losing a significant amount of water due to excessive exercise, sweating, or illness. Individuals who have severe dehydration will typically have symptoms.
During this summer, there have been stories that were resulted from a study from the American Journal of Public Health. The researchers had discovered that from 2009-2012, children from ages 6-19 (4,134 children) were being examined. They calculated the children’s urine concentration. The higher the value of urine meant the more concentrated that it was. The findings were that more than half of the children had urine osmolality of 800 mOsm/kg and even higher. They found that the children who consumed 8+ ounces of water each day had an average urine osmolality of around 8 mOsm than those who didn’t.
If you were to define dehydration as urine osmolality of 800 mOsm or higher, the findings of the study would be concerning. Most clinicians don’t use this method.
There isn’t any formal and proven recommendation for a certain daily amount that individuals need. The amount will differ by what someone eats, how big they are, where they live, and what they are doing. In the U.S, we have access to many beverages and it just isn't true that we are all dehydrated.
Source: NY Times
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