The importance of 'good' bacteria in the treatment of depression

The microbiome of the human gut has a significant impact on health and well-being, since it is made up of a mix of good bacteria and bacteria that can cause or exacerbate diseases in some cases. Long-term inflammation is regarded to be a driving force in many chronic metabolic disorders that start in the gut.

Intestinal flora has an impact on mental health, according to research from the University of Basel. The study looked at how probiotics can assist antidepressants work better, and hence help to reduce depression. This adds to the growing body of knowledge about the microbiome-gut-brain axis.

This has to do with how gut bacteria can affect the neural system. For instance, the discharge of metabolic products by so me species can control the manufacture and release of neurotransmitters via intestinal enteroendocrine cells via their metabolites. These can affect the enteral nervous system locally or send rapid messages to the brain through the vagus nerve. There is a link between this nerve and mental disease, and studies employing vagus nerve stimulation (VNS) for patients with treatment-resistant depression have had some effectiveness.

It has been found that many people who suffer from depression have a higher incidence of intestinal and digestion issues.

When the intestinal flora of persons with depression is implanted into mice grown in sterile settings, the animals exhibit depressive-like behaviour, such as being less active and showing less interest in their surroundings than their peers, according to studies.

As a result, a growing amount of evidence suggests that the bacterial flora in the gut plays a critical part in depressive symptoms.

Based on this, the Swiss investigators looked into the impact of probiotics on depression patients. All of the subjects were inpatients at the University Psychiatric Clinics in Basel, and some (21 people) received a probiotic while others received a placebo (26 subjects). In addition to antidepressants, this was done throughout the course of 31 days.

The subjects were subjected to a battery of tests prior to therapy, at the conclusion of the 31-day period, and four weeks later. While all participants' depressed symptoms lessened as a result of the antidepressant treatment, the probiotic group showed a larger improvement than the placebo group.

It was also discovered that the composition of the gut flora changed in the probiotic group, at least briefly. At the end of the treatment, there was a rise in lactic acid bacteria.

Importantly, the research implies that the microbiome's makeup can help with depression treatments, such as antidepressants; however, it does not imply that probiotics by itself can treat depression.

The findings of the study are published in the journal Translational Psychiatry in a publication titled: “Clinical, gut microbial and neural effects of a probiotic add-on therapy in depressed patients: a randomized controlled trial.”