Celiac disease is an autoimmune disease that affects the small intestine. People with this disease experience diarrhea and in children, a failure to thrive. People with celiac disease need to avoid glutens as found in wheat products. By eliminating this grain and anything made from it, the symptoms can disappear.
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Celiac disease is when your body can't absorb gluten (which is in wheat and some other grains). Because of that, people with this disease have to eat a special diet. This diet must not include any foods that contain things like wheat, barley, rye, and some other grains.