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Thanks to all who responded.  The advise overwhelmingly was that Fritos were most
likely the culprit.
I layed off of all offending foods and ate real mild foods for a few days and tried a few
fritos again (isolating the suspected food) and sure enuf,   like clock work 10 hrs later
a stomach ache, gas etc.
Guess it was that ole' cross contamination thang.
C'est l Guerre.
Thanks again.
Nancy

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