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POPSKids with high IQs grow up to be vegetarians "Vegetarians were more likely to be female, of higher social class and better educated, but IQ was still a significant predictor of being vegetarian after adjustment for these factors, Gale said. "Vegetarian diets are associated with lower cardiovascular disease risk in a number of studies, so these findings suggest that a such a diet may help to explain why children or adolescents with a higher IQ have a lower risk of coronary heart disease as adults," Gale said." Not everyone agrees, of course. But it makes a lot of sense to me.