When you create a character you should be given a random dice roll of things that you are potentially allergic to
Once you are allergic to something, another dice roll happens to determine how allergic you are
Stung by a bee? You're dead bro
Eat some cheese for the first time? Enjoy the shits kiddo
Harvesting wheat or barley? Good luck with all the sneezing you'll be doing
Allergies when?