Not all levels are vegetarian, though each level gradually eliminates animal products. The highest levels eliminate fruit and vegetables, eventually reaching the level of a brown rice diet. Other terms can be used in describing various vegetarian diets, though their exact meaning can differ. Demi-vegetarian is a term sometimes used to describe persons who eat no or little meat but may eat fish. Persons consuming fish but no meat are sometimes called pescetarians.
Many foods contain ingredients derived from the slaughter of animals.
Gelatine is made from animal ligaments, tendons, bones etc. which have been boiled in water. It is often found in confectionery, ice cream, and other dairy products . Animal fats refer to carcass fats and may be present in a wide range of foods, including biscuits, cakes, and margarines. Suet and lard are types of animal fats. Cheese is generally made with rennet extracted from the stomach lining of slaughtered calves.