In the article that appeared on 13 May in the journal Proceedings of the National Academy of Sciences, the research team concluded that the bacteria are less frequent in mice with induced obesity and with type 2 (adult-onset) diabetes. Furthermore, administering rather indigestible fibres such as oligofructose, known for its advantageous effect on intestinal biota, resulted in a recovery of the Akkermansia population in mice. The presence of the bacteria strengthens the intestinal barrier and is also inversely correlated with weight increase (fat storage), inflammation reactions in fatty tissues and insulin resistance. However, is there also a causal relationship between the favourable developments and the occurrence of Akkermansia bacteria?