How the gut affects the brain
The gut plays a central role in providing the brain with neurochemicals, such as serotonin. One main pathway between the brain and the gut is the vagus nerve. About 80% of these nerve fibres are signalling from the gut to the brain, and only 20% is the other way around.
Much of the information comes from gut microbes, which is influenced by diet and stress. The large intestine act as a fermentation organ and is heavily populated with microbes. The microbes break down fibres producing substances that are linked to positive health outcomes.
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