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I think most people would think this might be something nutty to do, and
up until a couple yrs ago, i would also.  However, I had a "celiac
moment" on board an Amtrak on the way home from Chicago to MI ( a very
long 5 hr trip).  I was with extremely good friends and am very grateful.
 I had obviously ingested gluten, and couldnt speak, was unable to move
by myself and was seeing black spots and was in a very cold sweat.  My
friends got me to the bathroom and I incapicated that room for the rest
of the trip.  Between diarrhea and vomiting, and almost passing out, it
was not fun.  Has I been alone or with someone who didnt know, I have not
a clue as to what would have happened.  At least if you had a bracelet,
they would know something.  Mary in MI