what foods have gluten – the protein found in bread and other foods. A decade ago no one seemed to have a problem with it, now there are gluten-free bakeries in many cities, restaurants provide a GF icon for gluten-free options, and supermarket shelves­ are lined with gluten-free products. Celebrities tout their gluten-free diets and support groups help people deal with celiac disease, the digestive condition caused by eating gluten. (For the lowdown on gluten, read what is gluten?)