Some good advice from a patient with Oral Allergy Syndrome to stone fruits and some vegetables which is related to having Silver Birch tree pollen induced hay fever:

“Given the discovery that if I heat the fruits and vegetables, I can consume them without reaction, my life with food has changed. I am now juicing fruits and vegetables, although mostly vegetables and finally feel as though I am attaining my nutrients naturally and without much fuss.
After I juice, I flash heat it in the microwave for 1min so that I can consume the juice without an allergic reaction. I have read in many seemingly reliable sources that microwaving foods very quickly can retain their nutritional value or vitamins. This is more so than boiling or steaming and other means of heating.”
Anon