I know exactly what triggered my CD, it was two years of taking a daily low dose of antibiotics prescribed to me by a dermatologist for an acne problem that I had since a kid. This over use of antibiotics killed all the good flora in my gut and allowed all the bad drug resistant stuff to over populate. This out of balance of bacteria in my gut caused inflamation which lead to me being diagnosed with CD in the colon after having two massive rectal fistuals appear next to my anos.
Well thanks to healingwell, I discovered the SCD diet and after 6 months of following this diet with fanatical dedication, I got my gut flora back into balance, which in turn, lead to both fistulas healing up and all my symptoms going away. No more blood in bms, no more white mucus, no more fistulas. The only drug I ever took was pentassa.
That was in 2007 , and I still follow the SCD diet and to this day, I have not had one symptom from my crohns since 2007.