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AP - CHICAGO (AP — Maybe you CAN blame being fat on your genes. But there's a way to overcome that family history — just get three to four hours of moderate activity a day. Sound pretty daunting? Not for the Amish of Lancaster County, Pa., who were the focus of a new study on a common genetic variation that makes people more likely to gain weight. It turns out the variant's effects can be blocked with physical activity — lots of it.