OAS, also known as pollen-food syndrome, is a Class 2 food allergy. “You first become allergic to a pollen via inhalation, and then start reacting to foods that share similar proteins. So this food allergy is secondary to the pollen allergy.
If you are allergic to birch pollen, try avoiding or limiting foods that cross react with birch pollen. The below list shows 37 common foods that may cause oral allergy symptoms if you suffer from birch pollen allergy.
Climate change linked to more pollen, allergies, asthma
Climate change may be partly to blame for the rise in hay fever and allergic asthma. Tests show that the more carbon dioxide emitted into the air, the more plants grow and the more pollen they produce.