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Ethnicity â Although Crohnâs disease can affect any ethnic group, Caucasians and people of Eastern European (Ashkenazi) Jewish descent have the highest risk. American Jewish people of European descent are four to five times more likely to develop IBD than the general population.
For example if you click Great Britain it will give you the common other regions found in people there and the percentages of the people it is found in. In that case about 1% of people in Great Britain (based on their testing) have European Jewish. 2% of Europe West has the same.... and 1% of Iberian have the same. This at least tells you that if you can trace your genetics/ancestry to those regions it isn't out of the realm that it traces back to a small amount of Jewish origin. As for the fact your Jewish DNA might be very small, keep in mind how DNA inheritance works for autosomal DNA.