Your gut, behind your belly button, produces over ninety percent of the serotonin in your body and about fifty percent of the dopamine. These are two hormones that are responsible for keeping you satisfied and happy, among other things. Problems in the gut are linked to problems in the brain due to a close link between the brain and the nervous system in charge of the gut. This system, called the enteric nervous system, is often called the second brain, or gut brain, because of its extensiveness and semi-autonomy from the brain in the head. A healthy gut is important for a happy mood and a healthy brain. Learn to stimulate your gut for a healthier and happier you.