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It's actually about Austrians - or at least that's where the data came from. I believe it's pretty explicit in the article, though I did have to check the linked journal article to make sure.

I am the same. Just want to add, if you want to be a vegetarian-convert try it by consuming traditional foods from vegetarian cultures it has done the trick for some of my friends. Vegetarian foods from traditional vegetarian cultures tend to be closest to wholesome vegetarian diet rather than the salad option available to most westerners or any other hap-hazard cookbook.

I'm a born-vegetarian as well and would like to add that contrary to what some westerners believe, vegetarian diet isn't just about salads and vegetables. If my mental ability was affected, I wouldn't be here reading comments on Hacker News.