I have Krohn's as well as being lactose intolerant, and am of Jewish descent. My ancestor's come from various eastern european countries, and I know of at least 2 other close relatives who also have Krohn's as well. I have heard from 2 gastro docs that these issues do, indeed, seem to be more prevelant in Eastern European Jewish descendents, and likely has to do with differences in diet, etc., just like African-Americans seem to have more cases of Sickle Cell...I suggest heading to Web MD for more info if you are courious.