A.B.
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Recent studies consistently show that a modern lifestyle depletes the gut's collection of microbes, but how lifestyle affects the diversity of this gut 'microbiome' is unclear. An analysis of the gut microbiomes of Papua New Guinean and US residents now suggests that western lifestyle may diminish the variety of bacteria in the gastrointestinal tract by limiting their ability to be transmitted among humans.
https://www.sciencedaily.com/releases/2015/04/150416132203.htm