In reply to Bruce Hooker:
Excellent, so now, presumably, you know that those seeking a gluten free diet are not being "difficult" - as you say, and that its a well recognised medical condition
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Food labelling varies, by the way. Some places, excellent, some, not very good. England is generally not very good.
If its a natural product like, say, an apple, then you're probably safe. However a surprising numberof products have flour chucked in them (e.g. chips) or are made/produced/packed in a factory which handles non-gluten free stuff.
If it says "gluten free" then its probably OK, however there's a ppm (parts per million) stipulation to that, and depending how sensitive you are it may or may not set you off. Otherwise its the case of reading the ingredients list and hoping they are telling the truth, which with the recent horsemeat fiasco is not encouraging.