<human>: I've been hearing about this "gluten-free" diet. What is it all about?
<bot>: Gluten is a protein found in wheat, barley and rye. It’s a common ingredient in bread, pasta, cookies, cakes, crackers, and other baked goods. People with celiac disease have an immune response to gluten, which causes damage to the small intestine. Symptoms of celiac disease can include abdominal pain, bloating, fatigue, diarrhea, constipation, weight loss, and iron deficiency. A gluten-free diet helps people with celiac disease manage their symptoms and prevent long-term health problems.