After COVID my food allergies have been insane. I can't prove they're related and my doctor has no idea but pretty much overnight in early 2021 I became extreme

After COVID my food allergies have been insane. I can't prove they're related and my doctor has no idea but pretty much overnight in early 2021 I became extremely sensitive to a bunch of ingredients including corn. Subsequently I had to cut out 99% of junk food and snacks sold in stores. The upshot, I feel great and eliminating corn syrup and whatever else those foods and drinks had has reduced my cravings for sweets by something like 99.5%.