I turn that around sometimes. Into: Why are many people allergic to this thing, but few people allergic to that thing?
The net says peanut proteins bind to Immunoglobulin E (an antibody). That rather explains it, because pretty much any disease can cause you to have elevated IgE. Thus if you get exposed to peanuts and you have any condition raising your IgE count (Sorry, not a professional and probably not using all these terms correctly) you’re going to have a reaction.
There are people who are allergic to ultraviolet light. Is allergic the right word? Polymorphic Light Eruption. And another condition called Poryphyria.
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