If you have the celiac disease then of course you know that gluten is not good for you. It can be a very disastrous thing for you because it can hurt your immune system and also your absorption of the food. If you are willing to eat the Popcorn because it is a very beneficial and also very popular snack especially while seeing the movie then of course you can't get it from the cinema.
We are familiar that in the Popcorn the problem is not with the corn but the seasoning inserted in them. If you want to have the gluten free popcorn then it is recommended that you are getting the popcorn in natural form without any seasonings to prevent yourself from eating the gluten.
Gluten is the Protein which is available in the seeds or grains. Cereals, pastas and similar foods are having a good amount of gluten in them. If you have the celiac disease then the gluten is the very harmful thing for you. You should remember that there are many foods available in the market which have this thing in them and it is your responsibility to read the ingredients before eating the food.