One of the Main reasons nut allergies are more common than the other types is because the proteins in nuts are remarkably resilient, they can persist even after passing through stomach acid and they spend much more time in the body. The more time a protein persists in the body the more likely your immune system will recognise it as a threat.
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Many nuts contain proteins called 'ARA H1', 'ARA H2', and 'ARA H3' and other proteins with a similar tough structure. These proteins are remarkably though compared to other proteins and can persist in the human body for a very long time.
Source
~ Book, Food Allergies A complete guide By DR Scott H. Sicherer
