Recently, I wrote about the effect a gastric bypass has on gut bacteria and how the changes were thought to contribute to the weight loss effect. A group of researchers have been able to isolate the bacteria, known as Akkermansia muciniphila, responsible for this effect in animal studies.
It is important to state that this is a research finding in animals under strict experimental conditions and that the results of this study can not be instantly extrapolated to produce the same effect in humans. Also, this effect can only be labelled as a weight loss contributing factor rather than the main causation.