Judging from my experiences and those of close friends who suffer from IBS, I think that a good amount of IBS patients can tolerate lean red meats (LEAN is the key word).
This is good, since they contain a specific strain of iron that is most effective in preventing anemia and most readily absorbable by the human body. I actually become borderline anemic when I go a week w/o lean red meat, no matter what subsitutes I impose.
I think people that can't digest it SHOULDN'T eat it, and should substitute ground turkey or a vegetarian substitute istead. HOWEVER, those whose bodies need it (me and many active women) should eat it...
-------------------- "The most wasted of all days is one without laughter." -- e e cummings