Where does the consumed flesh go?
I mean, where does it go? Is a zombie's anatomy the same as a humans? Just because it's rotten flesh doesn't mean that it's all gone to waste (no pun intended). If the digestive tract is rotted out of any working order, then where does the meat go? Do the zombies throw it up? Is that the cause for so much blood coming out of their mouths? If not, does it just sit in their stomachs until it's a smelly, pulpy mess?
I really don't expect you to have any answers. I just wanted to address an overlooked question. I'll leave you to ponder the meaning of life through zombie waste.