The IgG "allergies" come and go.
My food sensitivities have lasted more than 5 years. Someone told me once that you can have a food sensitivity that's IgA-mediated and those are more permanent than IgG sensitivities which tend to go away after a few months.
I've tried foods that I quit eating for 5 years, and I got very sick.
I'm sensitive to tiny amounts, a small fraction of a milligram of protein. I tried a vitamin E capsule made from soy once and I was sick for 2 days. I tried 1/16 of a grain of corn - I sliced it up with a razor blade - and I was severely sick for 5 days, in bed and unable to sit up for more than a few seconds because of back pain, only trudging outside now and then, to let my dog into the backyard to pee.
I've heard the IgE allergies also involve a "leaky gut". That's why children have more of them, they have "leaky guts".
Anyway, I mostly just wanted to post to share my list of "exotic foods" which people who have a lot of food reactions, might still be able to eat.