Humans can have allergic reactions to a crazy number of things, from understandable like bee venom, to random like little Timmy eating peanut butter at the next table over could kill you, to the counterintuitive like aquagenic urticaria (getting splashed with water makes you break out in hives). What’s in charge of that and how are reactions like anaphylaxis supposed to help?
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It isn’t a decision. The body isn’t choosing between things to be allergic to. It’s an immune system error.
It likely exists because the immune system has been selected by evolutionary pressures to be overactive rather than underactive and that’s just what it’s been overactive towards. Dying to an allergy is not supposed to help. Everything isn’t something that the body chooses and is helpful. The body is an incredibly dumb thing. If it was designed by an engineer they’d get fired.
Also, aquagenic urticaria isn’t an allergy.
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