World Vegetarian Day is observed annually on October 1 globally to raise awareness about the ethical, environmental, health, and humanitarian benefits of a vegetarian lifestyle. World Vegetarian Day is celebrated to emphasize environmental considerations, animal welfare and rights issues and personal health benefits to encourage people into ditching animal products. The full week between October 1–7 is observed as the International Vegetarian Week (IVW).
Vegetarianism was frequently referred to as a Pythagorean Diet, before the popularization of the term ‘vegetarian’ in the mid-1800s. Ancient Greek philosopher and mathematician Pythagoras was an early advocate for the diet hence, it was named after him. Established by the North American Vegetarian Society in 1977 and endorsed by the International Vegetarian Union in 1978, World Vegetarian Day is observed annually around the globe on October 1.