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This week on "20/20," we bring you more myths with a show we call, "Our Body: Myths, Lies and Straight Talk." Two physicians at the top of their fields give advice on what to believe, and what not to believe about your body.

Many people are convinced they will inevitably lose their memory as they age. It is widely accepted that a slow metabolism makes you fatter, that marijuana gives users the "munchies" and that men, in general, can drink women "under the table." The doctors' take on those and other questions will be broadcast Friday.

And we're trying something new: during "20/20" we will invite viewers to log on to the interactive webpage at ABCNEWS.com to test their "Body IQ." We'll tally your votes during the broadcast and post the results live.

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