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One-Shot Fat FixWant to fight fat? Eat less, exercise more-and get vaccinated. A fat vaccine is in the works at the Scripps Research Institute in La Jolla, California, where tests have led to leaner lab rats. The trick is blocking ghrelin, a hormone that slows down the body´s metabolism. The vaccine triggers the immune system to release antibodies that attack the hormone, enabling you to burn more fat. But don´t pass the holiday ham just yet. Human trials are several years away.

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