Many people consider veganism—the practice of not eating or using any animal products—an ideal, healthy, nonviolent diet. Some vegans avoid milk for health reasons, while others do so as a reaction to the suffering of cows, and they boycott the meat and dairy industry. Some even say it's unnatural for humans to drink the milk of another animal.
Krishna teaches in the Bhagavad-gita that ahimsa, nonviolence, is most perfectly applied according to spiritual principles. For example, Krishna encourages Arjuna to fight—despite Arjuna's pacifist protests—
by reminding him that freedom from negative karma comes only by acting according to the directions of the Supreme.
The teachings of Krishna consciousness emphasize the many transcendental benefits of milk. The Vedas say the cow is one of the mothers of mankind; cow's milk and its many preparations are a key part of the recommended diet for human beings. Milk is considered essential for the proper development of the human brain, enhancing our ability to understand and apply spiritual knowledge.
Srila Prabhupada, founder-acharya of the International Society for Krishna Consciousness, was aware of the exploitative nature of the modern dairy industry. In his books and lectures, he repeatedly condemned the slaughterhouse economy as the crux of all the world's problems and urged his followers to establish self-sufficient, agrarian economies centered on cow protection.