\nTo test their theory that the gut microbiome plays a role in the “senior moments” many of us experience, the researchers housed young (2-month-old) mice together with old (18-month-old) mice. Living (and pooping) in close proximity exposed the young mice to the gut microbiomes of the old mice and vice versa. After one month, the researchers examined the compositions of the microbiomes of the old and young animals.
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