บท 53: Chapter53 - Hot Pursuit

Zombies fed on human beings. Many survivors didn't know yet that zombies could die without food, although their death would only happen slowly. The lower level zombies could live longer without eating than the higher level ones because they were sluggish and didn't need much energy. They loitered slowly and lazily because they had nothing to eat. 

The higher level zombies had intelligence, nimble bodies, and superpowers, but all these needed to be supported by energy. Without eating human beings, high-leveled zombies would gradually degenerate into low-leveled zombies, and then the zombie virus in their bodies would begin to lose activity. When the virus in their bodies was completely dead, these zombies would become ordinary corpses and rot.