Nearly 30% of U.S. adults say they're trying to go gluten free--but unless you've been diagnosed with celiac disease, there's really no need. In fact, cutting all gluten foods (such as wheat, barley, and rye) from your diet won't necessarily help you lose weight. Gluten-free junk foods are everywhere, and a gluten-free cookie or slice of pizza is just as bad for you as the regular kind.