The question arises when, how and why man came acquire, against the inherent nature, the habit of eating meat? In a few regions the absence or paucity of vegetable food was the reason, while in some others climatic or environmental conditions prompted man to become a flesh-eater. In certain primitive societies, living in the midst of ferocious wild beasts of the forest, man had to fight with them and kill them in self-defence. He began to imitate these carnivore, and hunting, killing and eating the flesh of the victims, as also using their skins, bones, hair, etc., for his own use became a practice. But, many of those who were not so placed, began to emulate the practice ot of selfish motives, for sensual enjoyment, taste of tongue, licentious way of living, or on account of a cruel aptitude. The large majority of non-vegetarians consists of such persons, and they, knowing or fearing that they are doing something which is unnatural, unwanted, unnecessary and degrading, put forth various excuses and try to seek social, even religious, sanction for slaughtering and eating animals. As a result, in several sects and societies the practice of sacrificing various animals, sometimes even human beings, for the purpose of propitiating different gods and goddesses come into vogue, and man turned into a carnivore sometimes even into a cannibal, and that too of all the reasons, in the holy name of religion. In certain societies, social conventions, luxurious way of living, addiction to drinks or misguided notions about the nutritive value of flesh, fish and eggs encouraged the habit of meat-eating.