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Could bacteria in your gut predispose you to obesity?
Katherine Hobson at WSJ's health blog writes "The search for factors contributing to obesity has turned inward all the way to the middle of the gut, where as many as 100 trillion bacteria hang out. The mix of microbes in a given persons innards may emphasize may play some role in determining his tendency to put on pounds by governing how efficiently he digests food. (IGS researchers present at ASM)