What will happen if people start developing allergies to other common things like
potatos or beans (no more cholent) or milk or eggs (no more pasteries or cakes) or wine (no arba kosos on Pesach)?
What would happen if any food and any given ingredient in any food suddenly had a
noticeable % of people who were now allergic to it?
Would all food be banned from all public places?
How about in our homes, would no one ever have guests again?