The 8×8 principle of drinking water has no basis.

Like most of us, two doctors from the University of Pennsylvania often hear that one is called 8 The theory of the ×8 rule is that we need to drink 8 8-ounce glasses of water every day for optimal health.

Dr. Stanly Goldfarb and Dr. Dan Negoianu, both of the Department of Renal Electrolytes and Hypertension at the University of Pennsylvania in Philadelphia Department, they studied various previously published clinical trial data to find out whether drinking so much water is beneficial to the human body and whether there is a solid scientific basis.

In certain groups of people, such as athletes; people living in high temperatures, in dry environments; or in the case of certain special diseases, drinking more water is beneficial. But in ordinary healthy people, there is no research on the benefits of the 8×8 rule.

A popular theory behind the 8×8 rule is that drinking lots of water can help eliminate toxins from the body and improve kidney function. To some extent, yes, although there is no clinical evidence that drinking large amounts of water in this way is beneficial in healthy individuals.

Another theory is that organ function throughout the body will improve by drinking water in slow sips throughout the day, rather than in several large gulps. Researchers have found no data to support this theory.

Some people say that drinking too little water can increase headache attacks. In one small study, the group that drank more water reported fewer headaches than the control group, but the difference in number of headaches between the two groups was too small to be significant.

The relationship between water and beauty has also been studied. Although the truth is, only those who don't drink enough water will have their skin dehydrated, atrophied, and appear older. But many people still believe that drinking lots of water can increase skin radiance and keep it young.