Ruminococcus is a common genus of bacteria in the class Clostridia, which has been observed in nearly 90% of human microbiome samples.

Preliminary research has shown that Ruminococcus spp. might be linked with digestive disorders such as inflammatory bowel disease (IBD). These bacteria might also help digest sugars, which may encourage obesity and weight gain.


Chen, W., Lui, F., Ling, Z. et al. Human Intestinal Lumen and Mucosa-Associated Microbiota in Patients with Colorectal Cancer. PLoS One. 2012. 7(6):e39743. doi:10.1371/journal.pone.0039743

Crost EH, Tailford LE, Le Gall G, Fons M, Henrissat B, et al. Utilisation of Mucin Glycans by the Human Gut Symbiont Ruminococcus gnavus Is Strain-Dependent. PLoS ONE. 2013. 8(10): e76341. doi: 10.1371/journal.pone.0076341

 Hansen, S.G.K., Skov, M.N., Justesen, U.S. Two cases of Ruminococcus gnavus Bacteremia Associated with Diverticulitis. Journal of Clinical Microbiology. 2013. 51(4): 1334-336. doi: 10.1128/JCM.03382-12

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 Ze, X., Duncan, S.H., Louis, P., et al. Ruminococcus bromii is a keystone species for the degradation of resistant starch in the human colon. The ISME Journal. 2012;6(8):1535-1543. doi:10.1038/ismej.2012.4.