We’ve all heard the rule that we should drink eight, 8-ounce glasses of water each day to stay properly hydrated and healthy. But where did this rule come from? What is the science and research behind the recommendation? Do you need to drink more water if you work out a lot? And what about the foods, like soup and grapefruit, that have a lot of water in them? Do they count towards your daily water-total?
A new commentary in the British Medical Journal, where a doctor called the recommendation to drink six to eight glasses of water a day, “thoroughly debunked nonsense,” is causing many to question what had been considered hydration-law. To clear this whole water-recommendation thing up, we talked with some experts about hydration to get the real deal on how much you really need to drink.
Do I Need to Drink Eight Glasses of Water a Day?
Basically, there is no one-size-fits-all approach when it comes to optimal hydration, says Dr. Josh Wagner, owner of The Life House on Manhattan’s Upper East Side, where he practices chiropractic and sports medicine.
“Eight cups of water per day is the classic recommendation for keeping hydrated, but how could, say, a 105-pound woman need to consume the same amount of water as a 240-pound man?” Dr. Wagner asks. “I usually advise my patients to drink at least half their body weight in ounces of water per day, and to add even more water if they tend to enjoy caffeinated beverages or alcohol or if they have other health concerns, such as diabetes. You’ve heard it before, but water makes up such a large percentage of our bodies and is one of the most important parts of a healthy lifestyle.”
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