The pizza guy's got a certain skill that he has applied to this agrarian situation! *high five!*

The zombie disease, as portrayed in the show, confuses me. If the internal organs stop functioning, then how can the zombies get the body to move? Also, the body needs fuel to move, and even if the body somehow feeds on itself, the reserve is limited. Won't the zombies eventually die (really die) from the lack of food, the cold, etc.? The barn situation shows zombies need to feed on something beyond brain. Rick and the gang can just stay put on the farm for a couple of weeks at best, & wait for the zombies to die out.