According to experts, everything from our gadgets to our eating habits and ultimately modern life itself are eroding our brains, chipping away at neural pathways and making us slower, denser and less capable of original thought. Most recently, a study by the University of Montreal, published this month, found that eating large quantities of saturated fat can have a significant effect on brain function, damaging the neural circuits that govern motivation and even leading to a sort of addiction. Since the 1930s IQs across the world have largely increased thanks to better living conditions, improved nutrition and education. But scientists are now raising concerns that for the last decade, IQ scores have not just been levelling out but declining, and our collective intelligence has dropped by one IQ point in the last 50 years.

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Source: How you are killing your IQ every day