The scriptures give regulations for human life and set aside certain foods for human beings. That quota is divided into six categories, namely vegetables, fruits, milk products, grains, sugar and nuts. With these six ingredients we can maintain our health very well, far better than meat eaters maintain their health. Vegetarians are more healthy than meat eaters, and their endurance is greater, although they may not have brute strength. Just consider that the elephant is a powerful animal, yet he never eats even a scrap of meat.
All religious scriptures promote non-violence as the first principle of religious life.
Whatever we see is created by God. No one has the right to kill anything or anyone, because no one can create anything. We cannot create an animal. We cannot create even a mosquito, so we should not kill even a mosquito. Spiritual life means non-violence.