Bifidobacterium adolescentis was among the strongest microbial signatures associated with slower biological aging, while Succinivibrio dextrinosolvens showed one of the strongest associations with accelerated aging. It found a connection between gut bacteria and biological aging, not evidence that one causes the other. Biological age attempts to estimate how quickly the body is deteriorating physiologically, using biomarkers rather than a calendar. It appeared in Scientific Reports, a peer-reviewed journal, under the title "Gut microbiome signatures associate with DNA methylation-based biological aging." Bifidobacterium adolescentis was among the strongest signatures associated with slower biological aging, and Succinivibrio dextrinosolvens with faster aging.