<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, barley and rye. People who have celiac disease can't digest it properly, so they need to avoid it. A gluten-free diet means avoiding foods with gluten, like bread, pasta and other grains. It's also important to read food labels carefully to make sure you're not accidentally eating something with gluten.