Gluten-free foods include corn, cheese, nuts, quinoa and potatoes. Gluten is a group of protein in cereals, especially wheat. Gluten can make dough have a solid structure. In the proofing process of bread processing, gluten forms a network structure. Without gluten, this structure cannot be formed and bread cannot be fermented. Gluten-free food refers to foods that are completely gluten-free, such as gluten-free bread, pizza, some fast food and other staple foods. Gluten-free diet is mainly used to treat patients with celiac disease and gluten allergy, but it is also eaten by some stars and athletes as weight loss and fitness food.