Oops - I have to edit this, I just realized not too many folks have voted yet so it's not all that surprising!
all I know is, I made it to a ripe old age with no crohn's until after several years of antibiotics. and some people have had the same experience. I'm not saying it's the only reason, I'm sure it's multi factorial.
Jen, do you know if you or your aunt have the NOD2/CARD15 gene? that accounts for 1/2 Crohn's cases, approximately.