Is 6-8 Glasses of Water a Day Enough?

Pure WaterVery few people will argue that we don’t need to drink at least 6-8 glasses of water a day. The research is already in. A 2002 study involving 20,297 people found those who drank at least five glasses of water a day were 41% less likely to develop fatal coronary artery disease. A 1999 Harvard study of 47,909 health professionals showed that six cups of water per day reduced the risk of bladder cancer by over 50%. A 2009 study of 58 children showed that those who drank more water performed better on cognitive tests. And there’s more.

In 2004, the National Academy of Sciences released a study showing that the average woman needs about 91 ounces of water per day and the average man needs about 125 ounces per day. The report indicated that about 20% of hydration can come from a typical diet, leaving 73 ounces of water for the average adult woman and 100 ounces of water for the average adult man. That’s a lot more water than the adage of 6-8 glasses a day (48-64 oz).

Dr. Jethro Kloss studied water use and fluid loss in the 1930s. He found that every day the average person loses about 550 cubic centimeters of water through the skin, 440 cc through the lungs, 1550 through the urine, and another 150 cc through the stool. This adds up to 2650 cc per day in fluid loss, equivalent to a little over two and a half quarts (about 85 fluid ounces). He wasn’t too far off.

For more research and information on water, including filtration, water treatment, chlorination and water pollution, see Pure Water: The Science of Water.

Case Adams is a California Naturopath with a PhD in Natural Health Sciences, and Board Certified Alternative Medicine Practitioner. He has authored 26 books on natural healing strategies. “My journey into writing about alternative medicine began about 9:30 one evening after I finished with a patient at the clinic I practiced at over a decade ago. I had just spent the last two hours explaining how diet, sleep and other lifestyle choices create health problems and how changes in these, along with certain herbal medicines and other natural strategies can radically yet safely turn ones health around. As I drove home that night, I realized I needed to get this knowledge out to more people. So I began writing about health with a mission to reach those who desperately need this information. The strategies in my books and articles are backed by scientific evidence along with wisdom handed down through traditional medicines for thousands of years.” Case connects with the elements by surfing, hiking and being a beach bum.

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