Modern city dwellers have lost about half their gut microbes
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Quite a few microbes have abandoned the human gut, as humans have lost 57 of the 100 or so branches, or clades, of microbes currently found in chimps or bonobos and at least one other nonhuman primate, Moeller reported on 11 June at Microbe 2022, the annual meeting of the American Society for Microbiology. Moeller was also able to estimate when some of the human gut microbes disappeared. A few were lost thousands of years ago, and some have disappeared more recently, with city dwellers having lost the most, Moeller reported.