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Are you drinking enough water? |
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Written by Jodi Mailander Farrell, MCT
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Monday, 16 July 2007 |
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Eight is more than enough: Drinking eight glasses of water a day has been exposed as a myth. In 2002, a kidney specialist tried to find scientific evidence to support the advice. His report in the American Journal of Physiology found the rule was bunk and, like many urban legends, stemmed from a grain of truth. The dietary guidelines provided by the Food and Nutrition Board of the National Research Council do say that humans need one milliliter of water for each calorie of food (about 10 cups a day). But the same guidelines say that we get much of this liquid from the water in solid food.
How much then? Generally, if you drink enough fluid so that you rarely feel thirsty and produce one to two liters of colorless or slightly yellow urine a day, your fluid intake is probably adequate, says the Mayo Clinic.
Bottled or tap? Tap water is usually just as safe as bottled water and it typically contains beneficial fluoride. So quench your thirst at the faucet - unless you have immune system problems, high blood pressure (soft water can contain more sodium) or are prone to kidney stones.
Don't get dehydrated: Even mild dehydration - as little as a 1- to 2- percent loss of your body weight - can sap your energy. Strenuous activity, excessive sweating, vomiting and diarrhea can cause dehydration. Symptoms include mild to excessive thirst, fatigue, headache, dry mouth, little or no urination and dizziness.
Too much of a good thing: It's possible to drink too much water. It's called hyponatremia and it happens when your kidneys can't excrete excess water. Marathon runners and other endurance athletes who drink a lot of water are at high risk for this, but it's rare in most of us. | Only registered users can write comments.
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