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The fact that the difference in childhood IQ between vegetarians and meat eaters is larger among men than among women makes sense in light of the historical division of labor between the sexes. Throughout evolutionary history, men have traditionally hunted animals for their meat while women have traditionally gathered plant food. So vegetarianism – a complete and total eschewal of animal meat – should be even more evolutionarily novel and unnatural for men than for women. Women are 60% more likely to be vegetarians than men are (3.33% vs. 2.07%).
Childhood general intelligence has a significantly positive effect on the likelihood of vegetarianism at age 42, even net of a large number of social and demographic factors, such as sex, whether ever married, whether currently married, education, income, religion, religiosity, social class at birth, mother’s education, and father’s education, both in the full sample and among men and among women separately. There appears very little doubt that more intelligent children are more likely to grow up to become vegetarian as adults in the United Kingdom. One standard deviation (15 points) increase in childhood IQ increases the odds of adult vegetarianism by 37% among women and by 48% among men.
