It's extremely aggravating, especially when the ingredients aren't disclosed. I'm lucky in that my one anaphylactic allergy (sulfites) is pretty easy to avoid, but my husband is violently allergic to wheat gluten, and the crap is everywhere. We make nearly all of our food from scratch and almost never go out because of it. One of the recent unmarked culprits was a container of PARMESAN CHEESE from Hannaford. Don't ask me what wheat was doing in cheese, but the small amount he was using on his rice pasta was making him sick and took us about a month to track down...