The premise of "My Diet Is Better Than Yours" was disconcerting. When ABC teased the fitness competition show earlier this year, it seemed to be just a rehash of the long-running -- and controversial -- "The Biggest Loser." This version had all the markers of a potentially problematic dieting show: dramatic music and quick cuts, overweight people subjected to bizarre tasks in the name of health. It seemed that scale numbers were the only indication of progress.