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People of jewish origin are quite prone to celiac disease.  There are
many studis done in Isreal documenting an increased prevalence there.
The single largest ethnic group among the causcasians that I see
ifddentify themselves as jewish. Jewish people also have a higher
incidence of crohn's disease and ulcerative colitis.  these assciations
are well recognised by the medical communities.

Joe Murray
University of iowa
( not mediacl advice)