Vegetarianism and intelligence

Higher IQ at age 10 years was associated with an increased likelihood of being vegetarian at age 30... IQ remained a statistically significant predictor of being vegetarian as an adult after adjustment for social class (both in childhood and currently), academic or vocational qualifications, and sex
- IQ in childhood and vegetarianism in adulthood
Kanazawa claims it's because the purpose of intelligence is to respond to new experiences; vegetarianism being evolutionarily "new" implies that only smarter people will accept it.


  1. What do you mean by adjustments for social class, academic qualifications, etc? Do you mean adjustments were made to their IQ to normalize it w.r.t. their social class / education /whatever?

  2. @flywtink: For example, it might be that going to college convinces people to become vegetarian. So the relationship between intelligence and vegetarianism would only be accidental - the real relationship would be between education and vegetarianism.

    So the adjustments are to control for these things.