I don't know, I don't see any info that would be "official" other than what you found:
http://www.foodreactions.org/gluten/ But Celiac is not the only reason people can't eat gluten. For whatever reason, I guess Italy is pretty aware of people not being able to tolerate it:
http://glutenfreegirl.blogspot.com/2007 ... italy.htmlMy point wasn't the exact number of people in Italy with Celiac disease

It was that there are other places where people have food allergies or intolerances, we're not just some outlier here in the US. In another thread, which I can't find now, someone had said that it seemed like they had never heard about anyone having these issues in Europe, for example.
Leek
SAVING ONE DOG may not change the world,
but it CHANGES THE WORLD for that one dog.
American Brittany Rescue always needs foster homes. Please think about helping that one dog.
http://www.americanbrittanyrescue.org