Gluten is a family of proteins found in wheat, barley, and rye. Glutenin and gliadin are the two primary proteins found in these grains and they play a role in giving gluten-containing foods like dough its elasticity and bread its spongy texture. An ingredient that has been derived from a gluten-containing grain can be labeled as "gluten-free".

On the gluten-free diet, you can eat many foods including meat, fish, fruit, vegetables, rice, and potatoes. You can also eat gluten-free substitute foods and processed foods that don't contain gluten.