A problem with gluten free diet is that it has become one of the popular diets for living healty. So when you go to a restaurant and ask for gluten free food, they think you just want the diet version, not the celiac disease version. The diet version isn't totally free of gluten, just reduced gluten content.

Some restaurants are even asking for a paper to show you have the disease because they are tired of all the people asking for gluten free just because they are on a diet.

Don't have it myself but was working with someone that have it, together with a number of other food alergies.