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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.
In all of this research, he found no evidence to support drinking of eight glasses of water per day. Despite this lack of evidence, the typical advice is: According to most authorities, a sedentary person should drink at least eight glasses of water (about eight ounces each) per day. That totals a whopping half-gallon for the average couch potato. In metric land, eight glasses works out to roughly 1.9 litres.