By far, the Bacteroidales class are the most well-studied, including the genus Bacteroides (an abundant organism in the feces of warm-blooded animals including humans), and Porphyromonas, a group of organisms inhabiting the human oral cavity.
Researcher Jeffrey Gordon and his colleagues found that obese humans and mice had intestinal flora (gut flora) with a lower percentage of a family of bacteria called Bacteroidetes and more Firmicutes. However, they are unsure if Bacteroidetes prevent obesity or if these intestinal flora are merely preferentially selected by intestinal conditions in those who are not obese.
- Ley R, Bäckhed F, Turnbaugh P, Lozupone C, Knight R, Gordon J (2005). "Obesity alters gut microbial ecology". Proc Natl Acad Sci U S A. 102 (31): 11070–5. PMID 16033867.
- Ley R, Turnbaugh P, Klein S, Gordon J (2006). "Microbial ecology: human gut microbes associated with obesity". Nature. 444 (7122): 1022–3. PMID 17183309.
- Turnbaugh P, Ley R, Mahowald M, Magrini V, Mardis E, Gordon J (2006). "An obesity-associated gut microbiome with increased capacity for energy harvest". Nature. 444 (7122): 1027–31. PMID 17183312.
- Borenstein S (2006-12-21). "scientists link weight to gut bacteria". Sci-Tech Today. Retrieved 2007-02-09.
- Pubmed references: