Recent science has called the gut our "second brain," or "Enteric Nervous System" (ENS). It consists of two thin layers of more than 100 million nerve cells that line our gastrointestinal tract, from our sinuses all the way to our rectum, and serves as a vast communication network. We now know that the majority of neurotransmitters, or "chemical messengers," such as serotonin and dopamine, are made in our gut lining, with very little being made in the brain comparatively. However, the production of these chemical messengers is dependent on the right bacteria, fungi, and even parasites (collectively known as the microbiome), being present in our gut.

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