> The fact that people without Coeliac Disease buy gluten-free bread seems pretty mysterious to me.

So I know for a fact that if I eat large quantities of gluten, I break out in a rash and get a headache. I'm not a diagnosed Celiac sufferer, because I've been told it's an invasive test[1], and I'm not going to back to my symptoms and a gluten-filled diet just for confirmation.

I feel better when I don't eat bread - but I do buy gluten-free stuff once in a while, because, well, I can do without bread/pastries most of the time but really like to fill a craving once in a while, and I'd prefer not to suffer my symptoms.

[1] http://www.webmd.com/digestive-disorders/celiac-disease/celi...