I didn't poison it or anything, but I find the problem that I pretty well view food as just....energy to be spent, not as something to taste and savor. So, I always wolf it down (rarely tasting / savoring), and my stomach is just like "Damn you...whatever." to anything I eat. Basically, to me, food as a whole is just energy. Nothing special about it.
I have an iron stomach as well, because obviously I'm eating it without that knowledge. lol.