Later texts of Hinduism declare Ahimsa one of the primary virtues, declare any killing or harming any life as against "dharma" (moral life). Finally, the discussion in Upanishads and Hindu Epics shifts to whether a human being can ever live his or her life without harming animal and plant life in some way; which and when plants or animal meat may be eaten, whether violence against animals causes human beings to become less compassionate, and if and how one may exert least harm to non-human life consistent with "ahimsa precept", given the constraints of life and human needs. The Mahabharata permits hunting by warriors, but opposes it in the case of hermits who must be strictly non-violent. Sushruta Samhita, a Hindu text written in the 3rd or 4th century, in Chapter XLVI suggests proper diet as a means of treating certain illnesses, and recommends various fishes and meats for different ailments and for pregnant women, and the Charaka Samhita describes meat as superior to all other kinds of food for convalescents.