And then there are the people who develop food allergies as adults. While comparatively rare, it does happen. After I left the military, I spent a few years managing a multi-location family practice/walk-in group (doc-in-a-box). At the location where I had my office, there were two notable incidents of adult onset food allergies that eventually required emergency intervention. The first was the owner of another business in the strip mall where we were located; he was a German baker who started getting hives and other symptoms. Before it was determined that he was allergic to wheat gluten, he had an anaphylactic reaction. Luckily, he came to our clinic and was seen immediately. Unluckily (for me), his allergy lead to him shutting his business; I had been a frequent customer, not just of his baked goods but he made the best spätzle in town. The other was one of the doctors in the same clinic. He was ex-MOTP (I first met him as a TQ3 in Edmonton in the 1970s) who got out after his obligatory service. His symptoms were originally unexplained nausea, abdominal cramps and vomiting. Naturally he frequently used Gravol "tablets". It was only after anaphylaxis that happened at home (his wife was nurse) and the subsequent hospitalization, it was discovered that he had developed an allergy to corn starch. Corn starch is one of the inactive ingredients in Gravol (and almost all other anti-emetic) tablets.