"[W]ith meat the body will get the proteins, but mental proteins will not be there. If you are keen on spiritual life, eating meat is not worthwhile; but if you are keen on worldly life, it is all right. There is another spiritual reason. When you kill an animal you give him suffering, pain, harm.
God is in every creature, so how can you give such pain? Sometimes when someone beats a dog he cries, he feels so much pain. How much more pain then in killing. Animals did not come for the purpose of supplying food to human beings. They came to work out their own life in the world. When a human being is dead, the foxes and other animals may eat, but we have not come to provide food for those that eat the human body; we have not come for that purpose. Similarly, man eats the animal, but the animal has not come to provide man with food."
John S. Hislop, Conversation with Sathya Sai Baba, p. 19
While I am not a fan of Sai Baba, I agree with his view on vegetarianism.