I'm Bulgarian, I had an allergy and I really don't know what you're talking about - we do have food allergies here, we're not immune or something, just a lot of people are avoiding that term or don't like talking about stuff like that. Food shortage in the past is connected to that attitude of course, but it's really going away I think.

I guess you can still put walnuts where you want, if someone have an allergy he/she would probably say, that he/she is on a diet, that's accepted by society more than allergy apparently :)