What you've hinted at here is fascinating to me. Do you have some references? In case it's not clear, I'd like to read articles about food allergies that have

What you've hinted at here is fascinating to me. Do you have some references? In case it's not clear, I'd like to read articles about food allergies that have been common in USA for some time now becoming common in countries that are coming out of 2nd world status and into 1st world.