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Gut Bacteria Obesity

This handout photo provided by the Washington University School of Medicine shows Dr. Jeffrey Gordon and graduate student Vanessa Ridaura of Washington University in St. Louis example samples of gut bacteria taken from fat or lean people. Their research transplanted human intestinal microbes into germ-free mice and found certain bugs may help fight obesity, Thursday, Sept. 5, 2013, at the university in St. Louis. Call it a hidden ally: The right germs just might be able to help fight fat. Different kinds of bacteria that live inside the gut can help spur obesity or protect against it, say scientists at Washington University in St. Louis who transplanted intestinal germs from fat or lean people into mice and watched the rodents change. And what they ate determined whether the good germs could move in and do the job. (AP Photo/Elizabethe Holland, Washington University School of Medicine)

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