We have been lucky with restaurants, but I am admittedly an annoying customer. My daughter was so young when she was diagnosed, I don't know if she ever really had much of a tolerance. She has only accidentally eaten gluten a few times, but since she got diagnosed with type 1 Diabetes, vomiting can be dangerous. The last time she got gluten at a friend's house, they realized their mistake so we went to the er. I have to say that iv meds and fluids are the way to go when that happens. They immediately stopped the vomiting and kept her from getting dehydrated. Unfortunately when dealing with an er, they aren't quite fast enough. But once they started iv, it was much better. I hope this helps!