Your gut is often called the “second brain” because it houses the enteric nervous system and trillions of bacteria
(the gut microbiome).
These microbes don’t just digest food – they produce & regulate many of the chemicals that affect mood & wellbeing:
Serotonin: About 90% of serotonin (the “happiness chemical”) is made in the gut, not the brain.
Dopamine & GABA: Certain gut microbes create neurotransmitters that influence motivation, calmness & pleasure.
Inflammation & Stress: A healthy microbiome reduces inflammation & stress hormones, which in turn lifts mood.
Gut-Brain Axis: Through the vagus nerve, bacteria in the gut send messages directly to the brain, shaping how you feel day to day.