Vegetarian totally abstain from eating flesh of meat or fish  
Yeah , so I learnt.what makes a person a vegetarian?
People adopt vegetarianism because of health, religious or social issues
How how is the religious issues related to a vegetarian?
Some people become vegetarians because of respect to life. Some religion teaches respect to life in any form
So what about the health factor relating to a vegetarian?
Too much of animal protein is not good for the body so vegetarianism has good health benefits 
Lastly ,on the social issues ?