Fat, fat, thin

About six years ago, Diane and Jim McConnell and their son, James Jr., 11, embarked on a dramatic diet change. They decided to give up foods containing gluten, a protein found in wheat, rye and barley. Sticking to the regimen is no easy feat—gluten is ubiquitous in the American diet, as well as in other nonfood products. Not only is it in almost every kind of commercially baked good and pasta, it's even in medications, lipsticks and Play-Doh.

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