This document defines vegetarianism and provides information about vegetarian demographics globally and in various countries. It discusses some common reasons people choose a vegetarian diet, including personal health and religious beliefs. The document also profiles several companies that market vegetarian and vegan food, beauty, and clothing products, including Quorn, Linda McCartney Foods, Lush, and Dr. Martens. Finally, it outlines some non-vegetarian food additives and ingredients like gelatin, rennet, and animal-derived food dyes and clarifiers.