I was born allergic to milk and almost died. The allergy disappeared and now I love milk.
I know a little boy with severe food allergies, won’t go into too much detail. He has other issues too. His mother has worked on his tolerance and he, now, is able to eat things that, 3 years ago, would have landed him in the hospital. He has an epi-pen in his backpack and she has one on her at all times.
My inhaled allergies have gotten better, much better. My food allergies have gotten worse.