Protein...............is a necessary macromolecule used by OUR BODIES to create enzymes and muscle tissue. Animals are cultivated, hunted and eaten, because they have high amounts of protein stored in their bodies. Compounded by the fact they taste delicious, its as simple as that. The only incentive to eat fruits and vegetables comes from the fact that they have vitamins such as zinc, iron, vitamin,A,B,C etc. Which meat doesnt have. So a balanced diet of both is necessary.