I had food poisoning on a plane once, but the meal was before I boarded. I was puking so much and so often they moved people forward and me to the back. It was bumpier. By the time we landed I could barely walk and I was covered in hives. Six of the longest hours of my life.
It was osso buco, from a restaurant I've ordered it from many times, I had assumed the hives were stress related, I was really retching, but to the other commenter's point, no poops.