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What's Driving the Decline in IQ Scores?

Story at-a-glance -

  • Intelligence quotient (IQ) scores, which had been rising for decades throughout the 20th century, are now on the decline
  • It was long believed that people with higher IQs would have children with higher IQs and also that people with lower IQs would have more children, leading to an eventual lowering of IQ scores across the population
  • A new Norwegian study challenges both of these assumptions, suggesting instead that declining IQ scores have little to do with genetics and everything to do with the environment
  • In the study, brothers born to the same parents often had significantly different IQ scores, suggesting an environmental factor — not a genetic one — was causing the disparity
  • Changes in nutrition and exposure to environmental toxins like fluoride, flame retardants and pesticides could all be playing a role in lowering IQ levels

By Dr. Mercola

Intelligence quotient (IQ) scores, which had been rising for decades throughout the 20th century, are now on the decline, and researchers with the Ragnar Frisch Center for Economic Research in Norway set out to determine why.


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