human
I've heard that a lot of people are taking a gluten-free diet. What is gluten and why do so many people avoid it?
assistant
Gluten is a protein found in wheat, rye, and barley. It’s the glue that holds bread together. People who have celiac disease can't digest gluten, which causes them to get sick if they eat it. Other people may be sensitive to gluten and experience symptoms like bloating or gas when they eat it.