How Many Cups of Water Should You Drink Daily?
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Water is Essential for Good Health
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Water accounts for two-thirds of your total body weight. This balance must be maintained in order for your body to function properly. The recommended daily water intake for adults varies, but doctors generally recommend eight 8-oz. cups per day (the "8 x 8 rule"), according to the Mayo Clinic. Fluid obtained from food (normally 20 percent of a person's fluid intake) and other beverages can be included in this amount.
Water Needs Vary by Individual
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The amount of water you need depends on how much water you lose. For example, intense physical activity and heat exposure increases water losses and raises daily fluid needs, according to a report by the Food and Nutrition Board. The Board also specifies that the average man requires more water (the equivalent of 12.5 cups from all food and beverages) than the average woman (9 cups).
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Bottom Line
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The "8 x 8 rule" can be used as a guideline, but you should consider your health status, the climate you live in, and how active you are when judging how much water you need for optimum health. Do not rely simply on feeling thirsty, because by the time thirst strikes, you may already be dehydrated. To make sure you stay safely hydrated, the Mayo Clinic advises adults to drink a glass of water with and between meals, hydrate before, during and after exercise, and substitute sparkling water for dehydrating alcoholic drinks.
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