I’ve heard that there are also people who do not have coeliac disease but nevertheless are supposed to avoid gluten. Why is that?
It’s true that there are people who can be confirmed as not having coeliac disease but nonetheless react to food containing gluten with similar problems to a person with coeliac disease. This phenomenon is known as gluten sensitivity and is now subject to rigorous research. You’ll find details about the symptoms and the differences from coeliac disease here. It’s important that the matter should always be discussed with a doctor. Only a doctor can really find out what’s causing the problem and provide the correct diagnosis.