Did you know that vampire myths may actually have come from Medieval fears of a rare genetic disorder called porphyria? Guardian Liberty Voice has the story:
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The origin of the vampire myth may not have come only from the excitable minds of Middle Age peasants. Instead, a rare genetic disorder called porphyria might have started the tales, according to biochemist Dr. David H. Dolphin of the University of British Columbia and other scientists.
Porphyria is a rare group of at least eight blood disorders. A patient is diagnosed with porphyria if any of the eight different enzymes that create porphyrin, a body chemical which transforms into heme (another chemical the body needs) when in contact with iron, are affected. A patient lacking in any one of the eight enzymes is not able to produce heme, which is responsible for items such as cell differentiation and protein synthesis.