I am a vegetarian.  the roots of vegetarianism comes from civilization of ancient india and greece.
that's interesting.  Why did you become a vegetarian?
Most health related reasons though others do it for completely different reasons such as cultural, political or environmental reasons.
what would be some political reasons?
Its just one of many reasons.  Some people are even vegan and choose not to eat anything that comes from an animal at all.  Do you eat meat?
I do eat meat - I love all parts of cows and pigs!  Bacon on everything!  Is your whole family vegetarian?
banned the consumption of meat for ascetic reasons, but none of them abstained from the consumption of fish; these monks were not vegetarians, but some were pescetarians. Vegetarianism was to reemerge somewhat in Europe during the Renaissance and became a more widespread practice during the 19th and 20th centuries. The figures for the percentage of the Western world which is vegetarian varies between 0.5% and 4% per Mintel data in September 2006. 
Ancient.
Ancient Indian subcontinent.
Ancient Indian subcontinent Early Jainism and Buddhism.
Jain and Buddhist sources show
Vegetarianism
Vegetarianism is the practice of abstaining from the consumption of meat (red meat, poultry, seafood, and the flesh of any other animal), and may also include abstention from by-products of animals processed for food.
Vegetarianism may be adopted for various reasons. Many people object to eating meat out of respect for sentient life. Such ethical motivations have been codified under various religious beliefs, as well as animal rights advocacy. Other motivations for vegetarianism are health-related, political, environmental, cultural,