This document provides information about vegetarians and vegetarianism. It defines vegetarians and vegans, and discusses some of the main reasons people choose these diets, including ethics, health, religion and the environment. Demographic data is presented on the number of vegetarians in the UK and US, broken down by age, gender and over time. Some popular vegetarian food companies and products are described. The document also notes foods and ingredients that may not be suitable for vegetarians due to containing animal products.