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In the Monster Island books the author has a zombie and we see what he's feeling about eating, there's a glow, an enticing lifeforce that calls out to the zombie. Dead meat doesn't have anywhere near the appeal of the live and doesn't keep the zombies as... fresh? Anyway, I'd always assumed that zombies ate until all the life left their victim and if that happened before the unfortunate soul was ripped to shreds they would become a zombie. Some hung on longer than others or had to deal with more zombies feasting on them. The bigger the horde, the less new zombies spring to unlife.
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