Why do some vampires in Twilight have red eyes, but the Cullens have golden eyes?

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Vampires are meant to drink human blood. It is natural instinct, and most do it. The vampires that refrain from consuming humans and consume animal blood instead are the Cullens; they are the peaceful vampires. Vampires who normally drink human blood have red eyes, and get dull when they become thirsty. Unlike them, the Cullens' eyes grow a dark brown when they need more, and turn into a lighter, creamier golden once hunger is fulfilled. The Cullen family, however, has to feed more because animal blood doesn't satisfy their thirst as long as human blood would.

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In the "Twilight Saga" mythos, vampires with red eyes indicate that the vampire has eaten human blood, which is why James' coven has red eyes as well as the Volturi.

If a vampire has only had animal blood ("vegetarianism" as the Cullens say), like Edward's family, their eyes would be golden.

A newly embraced vampire would have red eyes for a time even if he or she only eats animal blood after becoming a vampire because he or she has consumed human blood in order to make the change.

All vampires' eyes become black when hungry.

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