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Are there any specific, endemically-human proteins in mind that vampires need to survive? I ask because the matter of precisely why they absolutely need human blood seems rather vague.
Jonathan Weygand, Birmingham, Alabama
|The relationship between humans and vampires
is not unlike a dialysis machine and a patient.
Vampires feed on humans because they too are human to a degree. Think of humans as being living dialysis machines, absorbing all the different varieties of food we consume, digest, filter and add to our own blood for continued survival. Vampires, being incapable of eating most foods, are forced to prey on humans to take what they cannot make themselves. Non-human mammals metabolize food using similar mechanics, but their blood chemistry is just too different to offer long-term sustenance. Trying to correct that is about as likely as making all blood types safe for everyone
— Robert Lomax, FVZA