Same observations here -
Interesting article with some hypothesis.
http://home.allergicchild.com/possible-causes-of-food-allergies/
However, I do endeavor to avoid foods with GMO and try to stick to natural foods only. I eat peanuts by the bushel and one thing I like about the Whole Foods is you get to make your own peanut butter on the spot. Just grind them up and ooze the butter into a plastic container. I do this with almonds as well. In fact, I would prefer almond butter to peanut butter if it wasn't so expensive. But I never eat any kind of nut butter that is sold on supermarket shelves that gets loaded with all that sugar and other additives.
Interesting article. I was born in 1940 and had developed allergies by the time I was 5 or 6. I did not see an allergy specialist until I was almost 30. He explained a lot about what had been happening to me my entire life.
I learned how to figure out what caused my symptoms and what to avoid.