‘Gut feelings: How the microbiome may affect mental illness and interact with treatment’, https://www.sciencedaily.com/releases/2016/12/161207093019.htm, ScienceDaily, American College of Neuropsychopharmacology (December 7, 2016).
Current state-of-the-art research in both animal models as well as humans point to the link between the gut microbiota and mood and anxiety models.
Emily Jutkiewicz. Gut Microbial Community and Behavioral Changes in a Chronic Mild Stress Model of Depression in Rats. Neuropsychopharmacology, 2016 DOI: 10.1038/npp.2016.239