Ever since I was a child, I remember having a stomach ache, multiple trips to the restroom and, occasionally, diarrhea anywhere from 30 minutes to an hour after I ate anything with a substantial amount of meat in it(i.e.: a deli sandwich would be less abrasive than, say, meatloaf). I used to think it was just how I handled food, until I became a vegetarian(for reasons unrelated). My stomach aches had ceased, and trips to the bathroom became much less painful
. I have been vegetarian for four years, and this still holds true.
I've been tested for allergies recently(again, for unrelated reasons)-which turned up nothing but an intolerance