The type of food we eat is most influenced by the environment around us. If you are born in a vegetarian family and people around you also eat vegetarian food, then it is obvious that you eat vegetarian food since childhood. I have seen many people who were non-vegetarians earlier due to their surroundings, but when they changed their environment and got a new environment where there were more vegetarians, they changed their eating habits. However, the most important thing is to eat a balanced diet which is digested well in our body and we do not get any disease.