http://en.wikipedia.org/wiki/Metabolism
Learn some biology and you'll realize that the chemicals and particles that you consume as food are the very same that make up your body
As a vore fan, I am probably more aware of how a metabolism works than you are, but thank you for the lesson.
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Save the animals, go vegan. For SuperNiceDog!
I am a proud female furry American. http://img81.imageshack.us/img81/696/ntisunitedwskn5.gif