Although soy is listed in the FDA’s “Big 8,” all eight allergens are not equally common. Soy is the least common on the list. To put this in perspective, cow’s milk allergies are about than soy allergies in people self reporting food allergies (think of how many people you know with lactose intolerance).
Soy allergies are typically detected during childhood and go dormant before adulthood. A 2010 study found that of the 0.4% of children allergic to soy in the U.S., 70% are estimated to outgrow the allergy by age 10.