The Inevitable Zombie Apocalypse!

i read some people questioning about why zombies bite once then leave, yet will occasionally stay for the whole meal.  

this is dependant on the stage at which the zombies decomposition has reached. in the initial and most mobile stages of a zombies “life” span, they will carry out their main function, which is to spread their virus. which is done by biting living humans. if you were to infect a human and then eat all of them… well, the virus just wouldnt spread. so they only take one bite because that’s all they need.

the second part of this, where they eat all or alot of the body, comes once the body starts to decay badly. the body realises it needs to find a way to ‘heal’ (zombies dont know they cant) to do this they need energy. we humans get our energy by eating (food is fuel!) and so zombies will begin to actually ‘eat’ a person rather than infect, in an attempt to extend it’s own “lifespan” (survival instinct y’know) and stop itself from decaying. hope it helps everyone!