Throwing Cold Water on '8 Glass' Theory

Do we really need to drink eight glasses of water a day to stay healthy? Two researchers writing in a British medical journal found no evidence to support that longstanding health advice.

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STEVE INSKEEP, host:

Good morning. I'm Steve Inskeep with some health advice.

You can ignore a lot of health advice. You've heard suggestions like drinking eight glasses of water per day to stay healthy. Two researchers went looking for evidence to support that claim. And in a British Medical Journal, they say it's a myth. They say there's also no evidence to show that reading in dim light damages your eyes and shaving your legs will not make the hair grow back faster.

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