What is in the food itself to cause the allergy?
An allergy to food is to the food protein. An allergy to apples will cause a reaction to Organic and Non-Organic Apples, since the allergy is to apples. However, if you are allergic to something else that might be on some of the apples, like Corn from a Citrus Wash and you have a Corn food allergy, then you might sometimes have allergic reactions to Apples when you aren't allergic to Apples and other times not have reactions to Apples because you bought it directly from a farm that didn't use the Citrus Wash on it.
This is how I eventually figured out I wasn't allergic to most fruits and vegetables, it was just my Corn food allergy causing problems.
It’s from a tick, Alpha Gal, I live in Missouri, we call it the Lone Star Tick or Deer Tick..