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The Harvard Health Letter published new water recommendations challenging the long-standing eight 8-ounce glasses-a-day rule, which they say werenât based on science, but instead an educated guess on what the body needs to stay hydrated.
The typical U.S. adult downs about four cups a day, which is shy of the Institute of Medicine's recommendation to drink about three liters of fluid for men and 2.2 liters for women. But others disagree with this assessment -- if that's the amount of water a person naturally drinks in response to thirst, that's fine.