Probiotics and depression: 'The link between the microbiome-gut-brain axis and digestive and mental health'

It has been hypothesised for years that a gut-brain connection exists. The gutbrain connection can often be described as having a 'gut feeling' or commonly that 'sinking feeling' - that sensation of nausea when anxious. Recently, there has been an increased interest in the influence of intestinal microbiota on mental health. It is thought that the intestinal microbiota influences the brain mainly through the vagus nerve by humoral and neural means of the gutbrain axis.