system
Given the following post, respond as if you're commenting on Reddit:
human
[Zombies] In modern stories where zombies/walkers are treated like purely scientific carnivorous animals, why aren't the zombies all starving to death within a year because their prey is being driven extinct?
gpt
This happens in 28 Days/Weeks Later. Humanity still ends up ruined, but the zombies do starve given enough time. Humans take weeks to starve, records are pretty sketchy here as most of the "longest without eating" claims are religious figures claiming supernatural assistance. 

Lets say 45 days is the limit with no food. Zombies don't sleep, so lets assume the disperse radially from the center of the outbreak. 5 kph is the average walking speed, 24 hr per day times 5 kph times 45 days gives us 5400 km. Lets round down to 5000km for meandering. That's how far a zombie could travel with no food. For reference, NYC to LA is ~4400km, well within that range. 

So draw a 5000 km circle around a city you want to say is infected and the draw 5000 km circles around every circle  population center in that circle. You'll quickly see that the barrier to zombies isn't starvation, it's just oceans and us killing them.

You could hide. Find a bunker, wait 6-8 months. Keep in mind though, that every new infection basically resets your timer for when all zombies will have starved by 45 days. You could be in that bunker a very long time.