In reply to Pesda potato:
Although it's almost as fashionable to have it as it is to deride it, I have a gluten intolerance. For 13 years I'd wake every morning with shocking abdominal cramping, aka IBS, and have to kneel on the floor beside the bed until it became tolerable enough to carry on with the day. I just thought that "it was something I'd have to live with", as the consultant put it.
Then I read that evangelical anti-wheat tract, and thought I'd give giving up wheat a go. Well, hello, the symptoms went away in a few days, in two months I lost a stone and a half, no more bloating, cramping, exhaustion, and generally feel fantastic.
To address your question about reintroducing a food product, the other day I thought I'd have a little bit of my son's veggie sausage (containing wheat) he'd left on his plate, just to see if I could tolerate it. Cue severe cramping, like I'd not had for over a year. So, no, won't be trying that again....