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rsteel02 said: Regarding the bacteria in our bodies, maybe the zombification process changes human biochemistry so that it's possible to have a symbiotic relationship with the bacteria.  If the zombie human cells and bacteria mutually live off each others' cellular poo, that could explain why it takes so long for a walker to starve.  According to the all knowing internet, there are 10 times more bacteria cells than human cells in our bodies.

http://www.scientificamerican.com/article.cfm?id=strange-but-true-humans-carry-more-bacterial-cells-than-human-ones