The response is a few hours afterwards because most foods(depending on the type) remains in the stomach for 2-5 hours after you eat it. So you had the food allergy test done already? Coconut Oil is the easiest fat to digest and absorb just FYI. Does it seem like sometimes you have this swelling problem with a food you have not had it with before? Like If you ate an apple one day you were fine, and then the next time it gave you these symptoms?