"Dehydration has already occurred by the time you feel thirsty," says Lisa Young, R.D., Ph.D., author of The Portion Teller Plan[1] (Harmony) and adjunct professor of nutrition at New York University.
"If you don't rehydrate, you may get muscle cramps, dizziness and fatigue, increasing your risk of heat-related illnesses like heatstroke and heat exhaustion," she says.
"The more you sweat, the more water you need," but eight 8-ounce glasses a day is a good start, Young says. "If you're an athlete, weigh yourself before and after exercise, then drink three cups of water for every pound you've lost."
Sports drinks are best for major exercisers (long-distance runners or those training for a triathlon).
Most of us don't need the added electrolytes and sugar, and can adequately replace sweat loss simply by drinking water, Young says.
Eating high-water content foods, like melons, is also rehydrating.
2. Check your medications.
Certain drugs can increase or decrease perspiration.
References
- ^ The Portion Teller Plan (www.amazon.com)
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