» This article refers to human nutrition and diet. For plant based diets in the animal kingdom see, herbivore. Vegetarianism is the practice of a diet that excludes all animal flesh, including poultry, game, fish, shellfish or crustacea, and slaughter by-products . The reasons for choosing vegetarianism may be related to morality, religion, culture, ethics, aesthetics, environment, society, economy, politics, taste, or health. There are several variants of the diet, some of which also exclude e… (More on Vegetarian)