The most studied proteins in apple allergy are called Mal d 1, Mal d 2, Mal d 3 and Mal d 4.

87% of people suffering from this allergy are thought to be sensitised to the protein Mal d 1, but may be allergic to other combinations of proteins.

Mal d 3 is a Lipid Transfer Protein (LTP), which is considered a panallergen - if allergic to this particular allergen you may have reactions to other foods containing LTPs.

Mal d 2 is a is a thaumatin protein, this is made by plants to inhibit fungal growth.

You may have Pollen-Food Allergy Syndrome if you suffer from apple allergy with oral allergy symptoms to 3 or more of the foods mentioned in cross reactivity section.

You may have LTP Syndrome if you react to multiple foods in the cross reactivity section.

If sensitised to Alder pollen you may have Pollen Food Allergy Syndrome and may also react to cherry, peach, pear, parsley, celery, almonds and hazelnuts.

If sensitised to Birch pollen you may have Pollen Food Allergy Syndrome and may also react to kiwi, pear, peach, plum, nectarine, apricots, cherries, tomato, celery, carrot, potato, parsnip, pepper, dill, cumin, peas, coriander, fennel, hazelnut, walnut, almonds, peanuts, lentils and green beans.

If sensited to Mugwort pollen you may have Pollen Food Allergy Syndrome and may also react to celery, carrots, dill, parsley, fennel, coriander, cumin and sunflower seeds.

Proteins with similar protein structures are strawberry, raspberry, asparagus and mango.

Other foods containing thaumatin proteins are kiwi, chilli, peppers, apple, banana, cherry and peach.

If sensitised to LTP proteins you may also react to kiwi, strawberries, sunflower seeds, walnut, apple, mulberry, banana, pea, apricot, cherry, plum, almond, peach pomegranate, raspberry, tomato, grape, celery, peanut, asparagus, cabbage, broccoli, chestnut, lemon, tangerine, orange, hazelnut, lettuce, lentils, lupin, green bean, pear, mustard, wheat and maize.

Let me know if you found any of these interesting or useful. If you spot an article or research that you think is interesting you can message me or tag me on Facebook or Twitter - links at the bottom of the page.