While you dont need to worry about the eight glasses a day rule, as you age you might need to pay extra attention to your bodys hydration needs. So does the fluid content of foods, which adds up to about 22% of the average Americans water intake. Moreover, despite what you may have heard, the water in caffeinated beverages such as coffee and tea does count toward keeping you hydrated. Actual fluid needs vary widely among individuals, and depend upon body size and energy expenditure through exercise, among other factors.įor most people, according to the Institute of Medicine, fluid intake, driven by thirst… allows maintenance of hydration status and total body water at normal levels. Rosenberg, MD, University Professor at the Friedman School and editor of the Tufts Health & Nutrition Letter. There is little scientific basis for stating a daily requirement for eight glasses of water, says Irwin H. If these thirsty, sweaty summer days have you worrying whether youre getting eight glasses of water a day-as conventional wisdom says you should-you need to take a closer look at the facts versus the fictions about hydration.
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