Yahoo, as usual, answers this question:
http://answers.yahoo.com/question/index?...232AAnXzuH
Quote:We have the biological system of an omnivore. Hydrochloric acid in our stomachs, NOT found in herbivores, enzymes in your pancreas designed to break down meat, NOT found in herbivores. No cellulase (the enzyme need to fully break down vegetation), cellulase is needed for an herbivorous animal, but we don't produce any. Our intestines are long (generally a sign of herbivorous animals) but our intestines are not nearly as long as a true herbivore. We possess canines, NOT found in herbivores.
http://answers.yahoo.com/question/index?...232AAnXzuH
"Never trust a fox. Looks like a dog, behaves like a cat."
~ Erin Hunter
~ Erin Hunter