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?
History of vegetarianism
The earliest records of vegetarianism as a concept and practice amongst a significant number of people are from ancient India and the ancient Greek civilizations in southern Italy and Greece. In both instances, the diet was closely connected with the idea of nonviolence toward animals (called "ahimsa" in India), and was promoted by religious groups and philosophers.
Following the Christianization of the Roman Empire in late antiquity (4th–6th centuries), vegetarianism nearly disappeared from Europe. Several orders of monks in medieval Europe restricted or
, 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