This thought never crossed my mind until now. My dd is pa and we don't keep pb in the house (of course). Well, she is always saying that she has a stomach ache. Could this be from foods that "may contain"? Have any of you had this issue, and did you find that there was a food that had hidden pb in it that was causing this problem. This has been going on for at least two years and I can't pin point the cause.