Most of which are terrible. Population studies are generally awful, especially when you're using the population of people on a restrictive diet vs. people eating whatever the hell they want to. Especially when you consider the number of vegans who are actually active vs. the rest of the population, which is quite substantial in my anecdotal experience. I think what you can see from these studies is that avoiding processed foods, being a healthy weight, and being active are good for you.

Also, what about the studies showing the children of vegan (it might even be vegetarian, can't recall) mothers have lower birth weights, IQs, and are shorter than the general population? What about the rates of B-Vitamin anemia?

I think that the benefits of being a vegan are the benefits of being concerned with your health. I'd be interested to see a comparison between an equally fastidious group of meat eaters.