I regularly have a UFO dessert (esp cheesecake ) after a safe meal. Teriyaki is safe, I had tons of it when we were in the US, its not as readily available here but never fear- I have a recipe that I keep meaning to try out!
Generally, I don't get cramps or D from the bad dessert. I might get a little gassy but thats it and once I "release" it I'm fine. How did you get on with it?