A gluten-free diet is primarily used to treat celiac disease. Gluten causes inflammation in the small intestines of people with celiac disease. Eating a gluten-free diet helps people with celiac disease control their signs and symptoms and prevent complications. Initially, following a gluten-free diet may be frustrating. But with time, patience and creativity, you’ll find there are many foods that you already eat that are gluten-free and you will find substitutes for gluten-containing foods that you can enjoy.