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shavenferret on 27 October 2025
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Conina said:
Chris Hu said:

Sure, that is the case, but leaded gasoline is still the main culprit in the decline of global overall IQ in the last 100 years, and we still have not recovered from all the damage that was caused by leaded gasoline.  

Which decline? IQ has gone up in the last 100 years (in all areas), not down:

Maybe the gains would be a bit higher without the toxic effect of leaded petrol (in big cities with too much cars), but there wasn't a decline.

https://en.wikipedia.org/wiki/Flynn_effect

Ok, and we are seeing a reverse flynn effect now.  I can link articles and academic journal studies if you like.  The point is that as america gets fatter and fatter we are losing the edge that got us to this point.  

Here is a sampling:  

1. https://www.popularmechanics.com/science/a43469569/american-iq-scores-decline-reverse-flynn-effect/     This discusses the reverse flynn effect, and notes a decline in things like verbal fluency as well as abstract reasoning because we've replaced things like philosophy with coding for better or worse. 

2.  https://news.harvard.edu/gazette/story/2025/10/researchers-report-astounding-obesity-surge-in-u-s/          This is the biggest reason as to why we are seeing a reverse flynn effect.   When the bodily machine isn't running as well, the mind won't run as well as it can.   

3.  https://www.nature.com/articles/s44220-025-00396-5   Effect of obesity on cognition...... basically echoes what i've been saying.