A gluten-free diet is a diet free from gluten.a protein found in wheat, rye, barley, and oats. It is a diet recommended for sufferers of celiac disease. Many grains are gluten-free such as corn, potatoes, rice, and tapioca. More and more gluten-free products are available these days as are recipes that fit the gluten-free lifestyle. Discovering how to use non-wheat flour can be a boon for home cooks who want to bake gluten-free goodies.