human
I've heard that a lot of people are switching to a gluten-free diet. What does that mean?
assistant
Gluten is a protein found in wheat, barley and rye. It’s found in many foods, including bread, pasta, pizza, and cakes. People who have celiac disease cannot digest gluten, so they must avoid it. However, some people may have a sensitivity to gluten, which causes them to feel bloated, tired, or sick after eating it. This is called non-celiac gluten sensitivity (NCGS).