I don't really know, but I have read that one theory is that food allergy is on the rise as a result of the increase in asthma. The two seem to occur together.
This was not a problem when I was a kid.
Aw, cmon. You can't be that old. Peanut allergy was around before you were born.
I saw a study the other day. Kids raised on farms have less asthma and fewer allergies.
They wallow in antigens.