Seafood, especially shellfish are notorious for causing allergies. If you've high cholesterol too and are a frequent shellfish eater, don't order such. As for nuts, any processed variety, read the small print on the package and you'll find that such has been processed on same machinery as peanuts ... and for some people this is a deadly circumstance. Overindulgence in just about any food has repercussions. Too, watch for interactive circumstances with prescribed medications. Goodbye grapefruit juice for me.