Isn’t there an anime called beast stars or something that attempts to answer this? I’ve never seen it, I never will, but I think it tries to address this question. They eat each other I think, but there’s societal regulations put in place that force carnivores to eat other foods besides people?

I don’t think there’s a really good solution to that besides forcing everyone to be vegetarian, confront the reality of being a humanoid animal in a world where animals that look like you are livestock, or eating each other.

they eat fent