Clearly human beings are not carnivores, but are we omnivores or herbivores? Actually we are both. We are omnivores in practice, with most people eating from both the plant and animal kingdoms. However, physiologically and emotionally  we are herbivores as explained below. The difference between our eating habits

Since maintaining a healthy and sound body is among the ways of       God . . . ,  one must avoid that which harms the body and       accustom oneself to that which is helpful and helps the body become       stronger. (Maimonides, Mishneh Torah, Hilchot Deot