Clipping of news on Brazilian Culture, Law and Citizenship
16/10/2013
This article was translated by an automatic translation system, and was therefore not reviewed by people.
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Drink two liters of water a day helps to maintain good health . Not according to the British medical Chris van Tulleken , which deconstructs the belief propagated by doctors and tipsters and raises a question : is there any scientific basis for this claim in the text below . Earlier this year , Australian scientists have made a new experience and it was described in the September issue of the journal British Journal of Sports Medicine.
The researchers wanted to find out what happens with the performance after dehydration. They took a group of cyclists and underwent exercises until they lost 3 % of its total weight in sweat. Their performance was then measured after rehydration three ways : 1 ) no , 2 ) liquid enough to return to the level of 2 % weight loss and 3 ) complete rehydration . The difference with previous studies is that cyclists here were not able to know their degree of rehydration , because the fluid was received intravenous way . This was vital because we all , and especially athletes , have an intimate psychological relationship with water consumption .
The result was the lack of any difference in the performance of cyclists completely rehydrated those who received no income . This study was part of a growing movement known as " drink when thirsty ," which hopes to persuade athletes not to hydrate in an exaggerated way to avoid the risk of diluting your sodium level .
Perhaps the result should not be surprising. Humans evolved doing exercises in environments of extreme heat and low humidity . We are able to tolerate the loss of water from relatively fine, but too much moisture can be much more dangerous. In simple terms : having excess water in the body is as bad as the opposite . But what about the rest of us who are not riding in a desert in Australia ?
There is a well accepted idea that we should drink about eight glasses of water per day (two or three liters) in addition to food and other drinks that have normally consume .
We are inundated with positive messages about the healing properties of water and how it is good for almost all parts of the body, from the brain to the intestines . Hence to think that a lack of water is bad for you is nothing more than a logical step - just like the idea that hydration should be good , purifying , cleansing their bodies , detoxing . It certainly improves your skin , helps you think, reduces disc development of kidney stones , makes your urine color is clear with champagne compared to the syrup orange fetid we produce in a long day , when it was not possible to take a sufficient quantity of liquid .
An article written by a group of respected physicians in American hospitals and French clearly supports the belief that you should drink two to three liters of water per day and states that people with a high urine output have a lower rate kidney stone , which the washing action of water can reduce the risk of urinary tract infection ( especially in women after sex ) . The authors make reference to a surprising study that showed that , paradoxically , increased water intake increases the risk of bladder cancer . But only if it's tap water . But there is a catch even more important .
A footnote at the end of the article explains that what you thought was a scientific paper in a scientific journal is actually a supplement sponsored by a major manufacturer of mineral water . All authors have received honoraria from the company, which also assisted theoretical . So this is not a search but a marketing piece .
And that's one of the reasons why we are still discussing this - because more and more drinking water does not come free from our taps . It is sold by the same people who sell us smart with yogurt bacteria that will probably not make us so well . And these companies are fairly consistent in recommending two to three liters of water per day.
So where does this number come from and what is the reason to think that is correct?
People who live in temperate climates and are not doing exercise need about six to eight glasses per day , which may be contained in food , beverages or drinks with caffeine .
Yes , beer and coffee does not dehydrate any visible action ( there is some good research on which medical students drank a lot of beer and then had their urine studied ) . There is no evidence that the addition of eight glasses of water you drink all that will do some good.
But the big advantage is that , as well as a high level athlete , you do not have to worry about this requirement on total daily water because your body will sort it all out for you . If you drink too much , will pee too . If you drink too little will get thirsty and urinate less. It is all exceedingly well controlled in the same way that the oxygen consumption is well controlled. Say you should drink more water than your body requires is like saying you must consciously breathe more often than you breathe naturally , because if some oxygen is good , then more must be better . Like most things in life there is a balance , an amount not too small nor too large .
This does not mean that the water intake to be underestimated for maintaining the body balance and thus a good state of health. The great thing is to realize that the industry is a powerful machine with gears and well made , but also our body 's balance and know your exact needs .
* With information from BBC
Source : UOL - Modern Consumer
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This article was translated by an automatic translation system, and was therefore not reviewed by people.