D.R.
I think it is possible. I had a really bad reaction one morning and we think it was to the shrimp I had the day before. My son has been breathing bad at night. I think he breaths worse on the nights he has ice cream. He has cereal every morning and I never noticed any kind of allergy, but I think because of the night breathing, I think he is. It must be very mild. Things can harbor in the body and come out in different ways. You just have to do testing (like avoiding it for a while and then seeing it what you noticed happens again the next time it is eaten).