That list sounds like a missing digestive enzyme ~ ~ I hope you’ve seen a doctor on the corn part. I’ve noticed that numerous “corn products” also have a gluten additive as well, and sometimes for no apparant reason.
I have a hunch that some of them I’ll be able to reintroduce. I think the major culprit was gluten, which I’ve since found out is genetic. Having eaten it most of my life probably created enough immune system upset that I’ve reacted to the other things. At some point I’m going to try reintroducing them one at a time.
One of the culprits is corn syrup in food products. It’s cheap to use and many people are probably allergic to corn syrup but haven’t gotten there yet in their search for answers.
I daresay he could also possibly eat rice.A very good source of carbohydrates to give him the energy to get through the day.
A missing enzyme you be intolerance not allergy. An allergy is an immune problem.