fad diets

Consumers are increasingly disillusioned with diet products and programs. But they're also confused by new terms like gluten-free and non-GMO, industry analysts and nutritionists say.

Many people who don't have celiac disease have ditched gluten, thinking it will improve their health. That's created more dining options — and more derision — for those with the autoimmune disorder.

A third of Americans say they're trying a gluten-free diet, even though celiac disease affects only 1 percent of the population.