A lot of food allergies do not show up on skin tests. These are the ones that are not IgE mediated - like mine. Som docs call these intolerances or sensitivities. My allergist is a lumpre, calls them all allergies.
I have no problem with corn, but when corn is processed it is soaked in hot sulfited water to soften it. Then it is processed by spray-drying, which often means it gets another dose of sulfite to keep the spray nozzels from clogging up. It then becomes corn starch, corn syrup, dextrose and other products. These are the problem, amny having 15ppm or more of sulfite. I can get away with a can of soda, but not more, before I get reflux and tachycardia. A more common reaction is migraine headaches. Check the ingredients in the pomegranite juice. It's never all juice, unless most of that juice is apple or grape.
The average allergist, not to mention other docs, has no clue about
the intolerance/sensitivity types of allergies. After skin testing I was told by my first allergist that I have no food allergies and sent on my way. It was the second one who had had 40 years of experience who said, "I see this all the time. Of course you have food allergies." My GI doc still doesn't believe I get stomach issues and tach from foods. My cardiologist doesn't say anything, but I'm pretty sure he doesn't believe in it either. My PCP has seen me in reaction, so he now does believe me.
I have no allergic reaction to vegetables or fruits, except garlic and onions, which contain a lot of sulfite. It's the spices, actually only pepper, garlic, onion and mixed spices - all of which are sulfited - which cause reactions for me. Salt and most individual spices are fine. I do get gas from lots of veggies, but that's a different story.
Corn-based sugars are a problem in large quantities. Dextrose (which is right-handed glucose) is in lots of things: artificial sweeteners as a filler, all kinds of foods that are processed, IV fluid (A liter has about
I get pretty sick from eating gelatin, sugar-free or not. Gelatin is made from sulfite-bath soaked pork skin, again for softening. Pork contains sulfite naturally. A delicious bowl will give me tachycardia within a few minutes.
So Percy cat - you are on track with getting your food allergies figured out. I wouldn't be afraid of challenge testing the foods you are pretty sure you CAN eat. That would save you a ot of time in a clinic, money too. I'd be surprised if your insurance would cover it.
Keep on keeping your food log and lists of foods tolerated and not. Once you get a list of intolerances you can probably make a connection.