Why to follow a vegan or vegetarian diet varies from person to person. Some do it for health, some do it for the environment and others do it out of respect for animals. I was so touched by the video below. This little boy has experienced so little of the world, but his resolve not to eat animals is rather touching and his argument very fair.
It's a choice anyone can make and not a requirement. As long as you make it a healthy choice, I would support your just as much as I support little Luiz in this video.