Many people experience reactions to foods but food allergy is only the cause in a small number of reactions.
Most adults who have a food allergy have problems with shellfish, fruits, vegetables or nuts.
The most common type of food allergy in adults happens when people allergic to tree pollen eat raw fruits or vegetables. This is called oral allergy syndrome or pollen food syndrome.
Milk and wheat rarely cause food allergy in adults, but are often thought to be a trigger of food intolerance.