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Zombies don't NEED to eat to survive. They run better when they eat but there's evidence in the first couple episodes that they survive without eating people. They just crawl around slowly and aimlessly.
People, on the other hand...
When you're in a coma, you don't really expend much energy. I wouldn't be super surprised if someone survived on nothing for a couple weeks in a coma. He probably woke up as a self-preservation response to needing something to drink or eat.
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