As far as I know, it’s a current field of research. The entire process of how allergies suddenly start out of nowhere in someone’s life is not well understood yet. We do understand how an allergen eventually triggers an allergy, but why the body suddenly starts considering a certain molecule as an allergene, I don’t think we have an answer for that. But I might be outdated in this knowledge, that was the consensus some years ago when I was still in college.
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