Most people have never heard of Celiac, and to over simplify it, it means wheat intolerant, or more specifically, wheat protein intolerant. This is not something you can catch from someone else, it is a genetic issue that makes your body treat wheat protein like a virus. It damages your intestines and the only cure for it is a strict gluten free diet.
This shows up in people in a variety of ways. Stomach bloating, cramping, malnutrition, patches of dry skin, intestinal issues, water retention, and you may wonder why this information is even on a wedding blog, but here it is:
When cooking for a wide spectrum of people, there are things to consider for each and every individual has personal and dietary restrictions. Some will be vegetarian, some Kosher, some lactose intolerant, a simple solution is having an additional dish that they too can eat, most caterers will not have a problem making an additional dish in a standard buffet. A dish that is meat, dairy, and wheat free can also be elegant and tasty.
Every guest should enjoy your wedding meal, and not only eat the fruit and vegetable.