Interesting. From the Nature abstract.
“The intestinal tract is inhabited by a large and diverse community of microbes collectively referred to as the gut microbiota. While the gut microbiota provides important benefits to its host, especially in metabolism and immune development, disturbance of the microbiota–host relationship is associated with numerous chronic inflammatory diseases, including inflammatory bowel disease and the group of obesity-associated diseases collectively referred to as metabolic syndrome.”
“These results support the emerging concept that perturbed host–microbiota interactions resulting in low-grade inflammation can promote adiposity and its associated metabolic effects. Moreover, they suggest that the broad use of emulsifying agents might be contributing to an increased societal incidence of obesity/metabolic syndrome and other chronic inflammatory diseases.”
http://www.nature.com/nature/journal/vaop/ncurrent/full/nature14232.html
See also:
http://www.iflscience.com/health-and-medicine/common-food-additive-promotes-inflammatory-bowel-disease-and-obesity-mice
http://www.reuters.com/article/2015/02/25/us-science-emulsifiers-idUSKBN0LT26S20150225