An article in Neuroscience News explores the brain-gut connection when it comes to mental health. They remind readers that 95% of all serotonin is produced in the gut, not the brain, and point out that researchers at Duke University are looking for ways to treat depression and anxiety by targeting serotonin molecules in the gut instead of the brain. Studies are ongoing in mice, and it is known that there is a sweet spot for the amount of serotonin—too much serotonin in the body can cause heart problems.  You may find the Neuroscience News article here.