yes different foods cooked in the same oil could result in cross-contamination as traces of the allergenic proteins may be left behind in the oil. cross-contamination can also occur on cutting boards grills and cooking vessels and utensils that are re-used without cleaning. when eating out at restaurants it’s important that you be vocal and communicate your allergies with your waiter/waitress so that the cook/chef can make the appropriate accommodations when preparing your food. even if you don’t think that the food that you’re ordering contains any of your allergens it’s better to have them check before you consume it to avoid further incidents. it will be important to mention that you have an allergy regardless so that you can be assured that proper food handling techniques are used and that there will be no cross-contamination. i would also suggest keeping a food journal so that you can better identify your triggers and gain a better understanding of your reaction to certain foods. in the case of severe anaphylaxis your doctor may equip you with an epipen so that you’re able to stop allergic reactions fast any contact with a food you are allergic to can cause an allergic reaction. best advice: if you're allergic to shellfish never eat somewhere that serves it. lobster is a shellfish and peanuts are in snickers. stay far away from things you're allergic to and talk to your doctor about an epi-pen.
can shrimp and french fries cooked in the same greese cause allergic reaction. hi at the age of 40 i developed an allergie to peanuts and shellfish at the same time. i had the test run they came back negative. so i went to red lobster and two hours later was rushed to the hospital with a shellfish allergie. two weeks later bought a snickers out of a vending machine back to the er.