Americans spend more than $6 billion a year on gluten-free foods, thanks in part to the products' health halo. But are all those potato-flour pastas and pizzas getting to the right stomachs? According to a recent Mayo Clinic study, 1.6 million Americans who are on gluten-free diets don't need to be, while the vast majority of the 1.8 million who could benefit aren't aware they should watch their intake. Who really needs to go gluten free?

ABC News (Prevention)

Tags: ABC News, gluten, gluten-free, gluten-free diets, gluten-free food, Mayo Clinic Rochester, Nutrition