Do Vegans Have Higher IQs?
The Myth: Vegetarians and vegans have higher IQs than meat eaters.
The Reality: Studies show people with higher childhood IQs are more likely to become vegetarian as adults. The relationship is IQ→vegetarianism, not vegetarianism→higher IQ.
What the Science Says
A large UK study (British Medical Journal, 2007) found that children who scored higher on IQ tests at age 10 were significantly more likely to become vegetarian by age 30. However, this doesn't mean vegetarianism increases IQ — it means higher-IQ people are more likely to choose vegetarianism, possibly due to greater openness to non-conventional ideas, health consciousness, or ethical reasoning. A vegan diet that is well-planned provides excellent nutrition. However, a poorly planned vegan diet lacking vitamin B12, iron, zinc, and omega-3s could actually impair cognitive function. The key takeaway: your diet choice reflects but doesn't determine your intelligence. Eat whatever diet you choose, but ensure adequate nutrition for brain health regardless.
Learn more about what IQ actually measures and what different scores mean.
Frequently Asked Questions
Are vegans smarter?
Higher-IQ people are more likely to become vegetarian — but the direction is IQ causes diet choice, not diet causes higher IQ. A British study found higher childhood IQ predicted adult vegetarianism.
Does diet affect IQ?
Nutrition affects cognitive development, especially in children. But specific diet types (vegan vs omnivore) don't increase or decrease IQ in well-nourished adults. The key is adequate nutrition regardless of diet philosophy.
Can a vegan diet harm brain function?
Only if poorly planned. B12 deficiency (common in unsupplemented vegans) can impair cognitive function. With proper B12, iron, zinc, and omega-3 supplementation, a vegan diet supports brain health perfectly well.
More IQ Myths Debunked
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MyIQScores Editorial Team
Editorial team focused on cognitive testing & psychometrics research
Last updated
May 10, 2026
MyIQScores content is written and maintained by our editorial team using published research in cognitive psychology and psychometrics as its source base. We label estimates as estimates, link primary sources where available, correct errors when readers flag them, and update pages as research or feedback warrants — see our corrections policy.