The document defines a vegetarian as someone who does not eat meat, including red meat, white meat, or gelatin. It originated from religions like Hinduism, Buddhism, and Jainism that believe in nonviolence towards animals. Some famous historical vegetarians include Leonardo Da Vinci, George Bernard Shaw, and Mohandas Gandhi. Statistics show the number of vegetarians is rising, especially among children and young adults in the UK and US. Reasons for becoming vegetarian include health benefits, ethics around animal treatment, and environmental concerns. The document also discusses major vegetarian food brands and some non-vegetarian ingredients found in common foods.