by 
Noodle
ANSWERS: 4
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I don't think there is a causal relationship.
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No, there is no evidence to prove any kind of diet makes a higher IQ.
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Higher than what?
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The short answer is "maybe". It is the case that improper nutrition can impair brain function and vegetarians are typically more conscious of their dietary choices. However, I don't believe that if you compared a population of properly-nourished vegetarians and properly-nourished flesh-eaters you would find any significant different in their average intellects.
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