Probably a controversial question

I am not trying to stir up argument but sould just like to know something. My Aunt was huge into colon cleansing and ate A LOT of fibre for several years....Like flax and psyllium etc. She ended up with Crohn's (SP?)disease and the Dr. said it was caused by to much Fibre. What do you guys think? Is there anyone out there who has been doing this for years with no side effects? Is there such a thing as too much fibre?