Anytime we talk about "banning" something I prefer a very conservative approach (conservative as in let's not ban things unless we are really sure). We are constantly learning new things that upend what we used to accept as science regarding nutrition and how the human body works. I think we do ourselves a disservice sometimes by banning things that we don't understand (and sometimes we think we understand but really…
Is there a list of stats for incidence of food allergies? It seems many friends I know (in EU) have food allergies to things like cucumber, hazel, peanuts, also gluten (celiax or something). One person I know has Crohn's disease. I would be curious to see the stats in both US and EU to see if it's really linked to a region's food. Or if it's just that common diets across the world are causing it.
Edit: or a third possibility is that rates haven't changed at all and it could be increase in either reporting or population making it seem like it's more commom now than before.