I have an allergy to soy that took years to figure out what it was. For a long time I thought it was dairy products. But, long story short about 10 years ago I finally found out that it was soy; so I started being very careful about what I ate - switched from using vegetable oil to using canola oil, etc. Since I've been low-carbing I use mostly olive oil. But I ate something the other day that caused me to wake up with a swollen eye - looked like my DH hit me in the middle of the night. LOL - he hates it when I say that. At least it wasn't like the old days where my lip would swell up and take over my face and cause me to look like elephant woman, or my throat would swell and send me to the emergency room. But, apparently, here it is again. I ate 3 things on Thursday that might have been the culprit, so I'm going to have to test things again. Since the insurance company stopped agreeing to pay for my Allegra, which has been the only thing that kept these problems at bay, I've had to switch to Claritin or Zyrtec. Since Zyrtec makes me into a zombie, Claritin has been my drug of choice and apparently isn't working any more. I have a suspicion that it's only soy bean oil that causes these incidents. My protein powder has soy lecithin in it, but it's the very last ingredient listed on the label. I also ate an Atkins Endulge bar that has soy lecithin way down on the label, but I also ate some Newman's Own Caesar dressing that had soy bean oil as the 2nd ingredient on the label. So, I'm going to start doing my own testing. And carry my Epi pen around with me for a while! And if none of those things work, I'll be requesting that my allergy doc send the insurance company a letter insisting on the Allegra.