A word about the China Study. The guy that wrote it grew up and a farm and grew up eating a diet of rich meat and dairy products. He subsequently became a highly respected expert in the field of nutrition and health and gave up meat and dairy products altogether.
I personally am vegetarian, mainly because I believe that eating meating means an unsustainable planet and because I strongly disagree with the concept of factory farming of livestock. Additionally, I am increasingly convinced that vegetarianism is the biggest single life style change that we can make to improve our health.