Science says your “gut feeling” isn’t a metaphor

“A 2011 study split a group of mice based on their personality: timid vs. adventurous. Then the researchers took another set of mice with microbe-free guts. In half, they installed the microbiome of timid mice, and in the other half they placed the microbiome of adventurous mice. Lo and behold those germ-free mice took on the personality traits of the microbiome-owner.”

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