I'm sure there's been more recently, but about a year ago I found out I don't have food allergies, just a stomach condition (SIBO) that mimics it. It's so new that all of the medicine is experimental, but I am able to eat dairy & gluten again, which is...incredible. I am so fat right now. I eat everything I come across because I don't know if it's going to revert at some point to merely looking at cheese & dying a painful death from the sight of it.
On the flip side, it was very beneficial to go through that ten years of having a horrible relationship with food. I learned how to cook. I learned how the food system (really) works. I got very much into H&F, particularly eating clean & bodyweight exercises, because I felt so much better. I also gained a huge appreciation for food & became a foodie because there's nothing as glorious being able to eat something you were deprived of for so long, even something as simple as good pizza (re: my fast food thread). So I guess every cloud has a silver lining. Would I ever want to go back to that tho? Heck no!