It's odd that they could do a study on that (as has been mentioned, how do you adjust for societal and other factors, esp. with such a slim margin), but there is some historical evidence. Pythagoras advocated a diet that we would, today, recognize as "vegan," and Leonardo da Vinci was known for buying bird at food markets and setting them free...
(As a vegetarian who thinks he's pretty sharp, I may not be an impartial judge!)
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