No Need to Guzzle All That Water, Expert Says

Newspaper articles, health and beauty magazines all advise drinking at least 8 full glasses of water a day totaling 64 ounces for optimal health -- an approach called "8x8" by proponents.

But Dr. Heinz Valtin of Dartmouth Medical School in New Hampshire said there is no scientific evidence to back up this advice, which has helped create a huge market for bottled water.

"After 10 months of careful searching I have found no scientific evidence that supports '8x8'," Valtin, who has written textbooks on the subject of human water balance, said in a telephone interview. [read more]

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