You seem to be rather ignorant. Buddhist cuisine for example is generally vegan. http://en.wikipedia.org/wiki/Buddhist_cuisine Granted, there is a fair amount of variation among sects. But it's also around 1/5th the size of Christianity so that's to be expected.
We're talking about veganism, not vegetarianism. You obviously didn't read the link you posted.
Edit: I'm responding to your recent edit. No, eating insects is not vegan. Why would you think that? Crickets and cockroaches are quite tasty with soy and sesame oil but not vegan.
The subject of the article would save his health and mind if he consumed eggs and milk.
Veganism when used by it's self is not clearly defined as seperate from vegetarianism.
"Dietary vegans (or strict vegetarians) refrain from consuming animal products, not only meat but, in contrast to ovo-lacto vegetarians, also eggs, dairy products and other animal-derived substances. The term ethical vegan is often applied to those who not only follow a vegan diet, but extend the vegan philosophy into other areas of their lives, and oppose the use of animals and animal products for any purpose.[4] Another term used is environmental veganism, which refers to the avoidance of animal products on the premise that the harvesting or industrial farming of animals is environmentally damaging and unsustainable.[5]" http://en.wikipedia.org/wiki/Veganism
PS: Also if you actaully read the link: "Jains are either lacto-vegetarians or vegans."
Some paths of Hinduism also hold vegetarianism as an ideal. http://en.wikipedia.org/wiki/Vegetarianism_and_religion
PS: World wide there are ~250million to 1 billion vegans depending on definitions. AKA is eating insects ok?