Do you think peanut butter might be the problem? As in most Americans don't eat raw peanuts but processed versions which might be more concentrated and exacerbate the allergies?
Peanut butter though is just peanuts, same concentration of everything as a peeled peanut. Large companies put lots of salt and sugar in too, I can't stand the sweet ones.
Maybe there's greater availability of some protein, or something, because of the processing?
