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Figure 1: Microbiome: the link between brain and bowels

The gut-brain axis links emotional and cognitive centres within the brain to peripheral functioning of the gastrointestinal tract, which is controlled by the enteric nervous system. Scientists are looking into the factors that influence this two-way system, including stress, which may be connected to changes in gut motility, an increased sensitivity to pain, and immune system activation and inflammation, all symptoms that characterise irritable bowel syndrome.

Source  Journal of Physiology and Pharmacology