Gluten-free foods are becoming more and more popular. This is because gluten-free diets can help people with celiac disease, who have an autoimmune disorder in which the immune system attacks the body's own cells. Gluten is a protein found in grains like wheat, barley, and rye that can cause many problems for those with celiac disease. Gluten-free food is also very popular for people who have allergies to wheat, gluten, or any other grains. The gluten-free diet has become a popular diet option for people who have health issues.