Zombies do not have anything running through their veins... they are (un)dead. They do not gain energy from eating brains rather they are simply compelled to consume them because that is the evil that drives them.
As for the cold, it does not effect them unless it gets cold enough to freeze them solid. In this case, they need only wait for the spring thaw (or a warm fire) before they can rampage once more.
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"My hands are on fire. Hands are on fire. Ain't got no more time for all you charlatans and liars."
- Old Man Luedecke
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