Shameless self-promotion
Fragment of a discussion from User talk:WaitingforGodot
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The blood type diet is the manifestation in the US and Europe. It seems that if you don't attach a personality test to it, you attach a diet to it.
Blood type isn't ancient or mysterious, so we can't blame mystical ancient knowledge for it; something else has to have generated the woo around it. The simple act of creating categories seems to be what unites them, from blood type, to star signs, to "I have Type XX personality".
