You've never had diarrhea? Ever? Food poisoning doesn't have to be so bad that it sends you to the hospital; sometimes, it's just enough to give you the shits. Although, you can eat your own shit without consequence; your body is already used to those bacteria. By the way, would you ever tell your friends about this? That should tell you how disgusting it is. Are you lax in personal hygiene in general?
I used to work in an office with a woman who was notorious for never washing her hands. All the girls talked about it. One day there was a potluck lunch and the woman was unhappy that nobody was eating the dish she had brought. I felt bad for her so I took some, and it was only after I took a bite that I realized why nobody else was eating it. Blegh.