Food effect

Two weeks ago my husband went out for dinner with a couple of colleagues. They went to what was announced as the best chinese restaurant stockholm has. I wonder if that title is correct, because the next day his stomach was aching and he went the bathroom over a dozen times. He said the food tasted great and he also had a few drinks with it, but as said the side effects became visible the next day. Weird thing is that his colleagues didn't have this, so it may also have been something else. I guess we will never know it.