Danny Cahill has spent much of his life fighting weight issues and now he wants to share his success story with Southwest Oklahoma.    The winner of the eighth season of “The Biggest Loser,” Cahill succeeded three years ago in losing 235 pounds — 55.8 percent of his body weight. But it wasn’t the first time he’s gained weight and lost a significant amount of it. He first tackled obesity when he was in high school.

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