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About porphyria, the word porphyria is used to describe many similar diseases or enzyme disorders in the body' heme pathways. Yet no, people do not need to drink blood to cure it, drinking blood does not help to treat the condition at all, that is a myth, the best way to treat porphyrial conditions is with vitamin supplements, a high-carbohydrate diet and sometimes phenothiazine drugs, if administered early in an attack. The condition does make people somewhat sensitive to daylight and their skin turns a slightly paler hue because this keeps them from being outside much, but drinking blood would not do anything to help the disease and may even prove harmful to someone who does so.
I agree....but this could also be where the origin of the misconception may have begun.
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Let's keep in mind that the "real vampires", the ones not created by Hollywood, but by local legends and cultural tradition, were terrible monsters and not even slightly akin to human beings, they were vile things to be killed on sight before they could attack you. Hollywood has romanticized it beyond recognition.
You do realize that there are many, many people all over the world that do actually drink blood beacuse they enjoy doing so....I know a few myself....not my cup-o-tea(or blood whichever the case may be)....but many of them fear the stigma that may be associated with this "craving"(for lack of a better word) that they feel. Do a little research before before you label them, I beg you, I agree that the whole "wannabe" cult culture is pathetic...don't ridicule them...pitty them...they need more help than you may know.
I agree that the "Hollywood Vampyre" does not, nor ever did exist, but we call bats that drink blood Vampire Bats...so what exactly do we call people who drink blood...and please save me the crackpot/idiot with low self-esteem remarks(even though in some cases it may be relevant)...I'm looking for a technical reference....and I don't believe in Mermaids, lol.