From what I can tell, if they're back from the dead, all of them would be covered with rotten flesh. Why eat that when you have 6+ billion walking buffets of fresh meat? You've seen rotten meat, right?
If it's something like a virus as in, let's say, Marvel Zombies, it would be a trial-and-error kind of situation. They'd try eating each other, but if the virus taints the flesh, the living are just screwed.
We're just gonna have to hope a lot of them were into necrophilia in their past lives. Would save a lot of time. I don't think any living human would turn down food over sex if they're literally starving, like just hours away from dying.
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