I'm a vegetarian.  Do you know the history of vegetarianism? 
From what I know Vegetarianism got it's roots in ancient India and ancient Greece
What vegetables did the people eat during that time? 
Much the same as what we eat today. The concept is not to eat flesh. Some people include dairy and eggs while others don't.
So the practice is pretty much static? Has any advancements been made in it since the inception? 
Other than things like meatless meats it's stayed the same. It's all connected with the idea of nonviolence towards animals. It was originally promoted by philosophers and religions
What other areas of the world is it practiced in?
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
, but when you look into the character, there is more depth to her—she's got a terrible mother, there's her background, and so on. You see her eating and, hopefully, people are intelligent enough to go, 'Ah, we can see why she does that.' [...] I'm hoping people will see it's not just about what she looks like. You don't have to be a big person to know that people comfort eat, or to say, 'These