Kwayoyin microbes da ke hanjinmu kan ɓace a hankali da tsufa, kuma hakan na da tasiri fiye da yadda aka yi tunanin. Binciken *Nature Aging* ya gano cewa *Bifidobacterium pseudocatenulatum* na raguwa a ko'ina a tsakanin manyan ƴan ƙasar Sin. A berayen da suka tsufa na halitta, ba da wannan kwayar a baki ya rage kumburi mai ƙasa‑ƙasa (inflammaging) a jiki kuma ya tsawaita lokacin lafiya. Masu binciken sun gano sinadarin 5‑AVAB (5‑aminovaleric acid betaine) a matsayin ɗaya daga cikin dalilan wannan tasiri, kuma matakin wannan sinadari ma yana raguwa da tsufa a mutane.
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