There are a variety of reasons to drink plenty of water each day. Adequate water intake prevents dehydration, cleans out the body, and promotes healing processes. Substituting water for beverages high in calories can also help control weight.
There is no clear-cut answer as to how much water to drink per day, because it depends upon a number of factors like your health condition, your activity status etc. On an average daily basis, we tend to lose quite a lot of water through sweating, exhaling and urinating. It is here that it becomes necessary to consume more water, so as to make up for the loss.
Your water intake also depends on the place where you are living and the climatic conditions over there. In hot humid weather, there arises a need to consume extra quantities of water, because there is a major loss of water through sweating that puts you at a risk of getting dehydrated. In cold season or at higher altitudes, you tend to urine more often, thus leading to a greater amount of fluid loss in the body.
Health conditions also determine your water intake. In case you are suffering from health problems like fever, vomiting and diarrhea, then it leads to excessive body fluid loss. Pregnant women also need to drink more water, as they are at a higher risk of getting dehydrated. So, drink loads of water throughout the day to keep fit and healthy.
You've probably heard the "8 by 8" rule - drink eight 8-ounce glasses of water per day (2 quarts, 1.8 liters) - but the amount of water a person needs varies depending on his or her weight and activity level. Another way to determine your specific recommended water intake is to divide your weight (in pounds) by two. The resulting number is the number of ounces of water you need each day. For example, if you weigh 150 lbs., strive to drink 75 ounces of water daily. For those who use the Metric system, divide your weight (in kilograms) by 30 (ex. somebody weighing 70 kg is going to need 2.3 liters per day). Keep in mind that these recommended intake numbers are controversial and some experts believe they are a gross exaggeration.
It has been emphasized that large intakes of fluid, equal to and greater than 8 x 8, are advisable for the treatment or prevention of some diseases, such as kidney stones, as well as under special circumstances, such as strenuous physical activity, long airplane flights or hot weather.
Despite the dearth of compelling evidence, then, what's the harm? The fact is that, potentially, there is harm even in water. Even modest increases in fluid intake can result in "water intoxication" if one's kidneys are unable to excrete enough water (urine). Such instances are not unheard of, and they have led to mental confusion and even death in athletes, in teenagers after ingesting the recreational drug Ecstasy, and in ordinary patients.
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