Miche,First of all, the lady who told you that IBS leads to cancer is wrong. That is not a fact as established in many studies historically.Secondly, I can tell you that flax seed has a very significant laxative effect, so if your problem is diarrhea, I would not try the full dose the first time you take it...it's hard to say what will happen...it does, indeed have a laxative effect, though.What symptoms are you especially trying to relieve...diarrhea only, or others as well?