The term was popularized with the foundation of the Vegetarian Society in Manchester in 1847, although it may have appeared in print before 1847. Modern dictionaries explain its origin as a compound of vegetable ( adjective) and the suffix -arian (in the sense of agrarian). The first written use of the term 'vegetarian' originated in the early 19th century, when authors referred to a vegetable regimen diet.

While some vegetarians scrutinize product labels for such ingredients, others do not object to consuming them, or are unaware of their presence. Packaged and processed foods may contain minor quantities of animal ingredients. While avoidance of animal products may support health and ethical concerns, dietary supplements may be needed to prevent nutritional deficiency if all such products are shunned, particularly for vitamin B12.

Maintenance of a vegetarian diet can be challenging. As the strictest of vegetarian diets, a vegan diet excludes all animal products, including eggs and dairy (and even extends to abstain the use of any animal derived product). There are many variations of the vegetarian diet: an ovo-lacto vegetarian diet includes both eggs and dairy products, an ovo-vegetarian diet includes eggs but not dairy products, and a lacto-vegetarian diet includes dairy products but not eggs. Preference for vegetarian foods can also be linked to one's own socio-economic status and evolutionary factors. Other motivations for vegetarianism are health-related, political, environmental, cultural, aesthetic, economic, taste-related, or relate to other personal preferences. Such ethical motivations have been codified under various religious beliefs as well as animal rights advocacy. Many people object to eating meat out of respect for sentient animal life. Vegetarianism may be adopted for various reasons. It may also include abstaining from eating all by-products of animal slaughter. Vegetarianism is the practice of abstaining from the consumption of meat ( red meat, poultry, seafood, insects, and the flesh of any other animal). Ovo, lacto, ovo-lacto, veganism, raw veganism, fruitarianism, Buddhist vegetarianism, Jain vegetarianism, Jewish vegetarianism, Christian vegetarianism Practice of abstaining from the consumption of meatĭiet derived from plants, with or without eggs and dairy

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