<human>: I've been hearing about this "gluten-free" diet. What is it all about?
<bot>: Gluten is a protein found in wheat, rye, and barley. People with celiac disease have an autoimmune reaction to gluten, so they need to avoid it completely. For people who don't have celiac disease, eating gluten can cause digestive problems like bloating, diarrhea, and constipation. The gluten-free diet is meant to help people with these symptoms by eliminating gluten from their diets.