Jenny Craig brand ambassador and singer Mariah Carey (left) poses with Dana Fiser, CEO of Jenny Craig, at a press conference in New York City in November. Cindy Ord/Getty Images hide caption

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The Real Holiday Party For Weight-Loss Firms? It's Now

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Many doctors and patients aren't discussing the health consequences of weight. iStockphoto hide caption

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Why Doctors And Patients Talk Around Our Growing Waistlines

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Hoodia gordonii plants like this one have been used by generations of bushmen in Southern Africa's Kalahari desert as an appetite suppressant. But the Federal Trade Commission isn't sold on that idea. David Silverman/Getty Images hide caption

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One recent study found that people were able to burn up an extra 450 calories a day with one hour of moderate exercise. That can include walking briskly, biking or swimming.

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Losing Weight: A Battle Against Fat And Biology

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Hormones And Metabolism Conspire Against Dieters

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