Is it possible for someone to develop a food allergy as a teenager?

Yes. New food allergies in teenagers are like those in adults - usually tree nuts or shellfish. Tropical fruit allergy - mango, banana - can occur at this age. Food-associated exercise-induced anaphylaxis presents in teenagers. The most common food allergen here is wheat. Oral allergy syndrome also presents in teenagers with symptoms of itchy mouth & throat to raw fruits & vegetables.