Gluten-containing foods will be any wheat, grain, or food products that contain any of the two types of gluten protein: gliadin and glutenin. Wheat products are the most ubiquitous gluten-containing foods. Rye, barley, and seitan all also contain gluten. And so do all conventional baking flours such as all-purpose, whole wheat, bread, pastry, and semolina. Most bread, pasta, and bakery items sold contain gluten in one form or another. Mother Nature's gluten-free foods include all fresh fruits and vegetables, meats, eggs, pure dairy products without additives, rice, and certain ancient grains like quinoa, buckwheat, and millet.