There are blood tests that can determine if you have food allergies. I know because at one point I was having a lot of digestive issues and we thought they might be food allergies. According to my allergist, the tests sometimes yield false positives but rarely yield false negatives. I also know, because I have friends with children that have food allergies, that it is very hard to pinpoint food allergies through an elimination diet. So if you think you have food allergies, I would strongly suggest seeing an allergist and having the blood tests.
I have very severe environmental allergies, but no food allergies (well, I seem to be allergic to Brazil nuts, but that's it). My digestive issues were all the result of taking decongestants in pill form (Claritan D) for many years. Once I stopped taking the Claritan D, my digestive issues cleared up. Foods that I absolutely could not eat when I was on Claritan D are now no problem whatsoever. If you have environmental allergies and have been taking a decongestant in pill form for many years (I took Claritan D on a daily basis for something like ten years) and are having digestive issues, you might want to talk to your allergist about this as well. I now take a combination of Zytec (the anti-histamine only, no decongestant) and Nasonex (a decongestant in the form of nasal spray) and it works just as well as the Claritan D did. And I can eat whatever I want. According to my allergist, the pill-form decongestants work by constricting your blood vessels throughout your body, including in your digestive system, which can result ultimately cause digestive problems. The nasal sprays target only your sinuses, making them more effective and less likely to cause other problems.
I also have to say that, given my experience with Brazil nuts, there's no way I would crave food that I'm allergic to. My reaction to Brazil nuts is very unpleasant (my ears and throat itch and swallowing becomes very painful), there's no way I would want to eat them.
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