Part II. Microbiome and Mental Health: The Gut – Brain Axis

“eating foods with high levels of tryptophan or sweet and starchy carbohydrates boosts serotonin, the “contentment” neurotransmitter that curbs cravings, suppresses appetite, and leaves you feeling satisfied and full. Close to 60% and 90% of all your dopamine and serotonin respectively is produced in your gut, and microbes regulate levels of these mood-regulating neurotransmitter production.
Because of this gut-brain axis, neurotransmitter levels in the gut and brain mirror one another. A low level of neurotransmitters in the gut leads to constipation and indigestion, while a low level in the brain can manifest in depression. Conversely, an abundance of neurotransmitters in the gut leads to cramping and diarrhea, while an abundance in the brain can manifest in anxiety.”