The makers of laxatives have a new message for you: “Cleansing your colon is cool, and it could keep your heart healthy and your waistline trim.” But, that spin is prompting concerns among doctors and dietitians who see potential for abuse. Especially since a number of consumers have embraced the idea that Metamucil can help them slim down in a hurry by sweeping their colons clean. But, is Metamucil’s “Beautify Your Insides” ad campaign healthy or harmful?

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