<human>: I've heard that a lot of people are switching to a gluten-free diet. What does that mean?
<bot>: Gluten is a protein found in wheat, rye, and barley. People who have celiac disease or gluten sensitivity can't digest it properly, so they need to avoid it. People who want to try a gluten-free diet may be doing so for health reasons, such as reducing symptoms of irritable bowel syndrome (IBS), or because they're trying to lose weight.