The effect of probiotics or good bacteria is conveyed to the brain through the gut brain axis
Probiotics may be good for more than just your gut health. They may also help treat bipolar disorder and other psychiatric mood disorders, because of the intimate relationship between gut health and brain health. There is in fact a connection called the “gut-brain axis” (GBA), allows for crosstalk between the endocrine, immune, and autonomic nervous systems.
Bipolar disorder is a psychiatric condition characterised by dramatic shifts in mood from depression to mania. Currently, the standard treatment includes a combination of psychotherapy and prescription medications such as mood stabilisers and antipsychotics.
There is also mounting evidence linking imbalances in the microbial species that make up the gut microbiome to a number of health problems including allergies, autoimmune disorders, and psychiatric mood disorders