We review the research ” First study shows tie between probiotic and improved symptoms of depression ” in how it alleviates depression as well as alter brain function Citation Title: Probiotic Bifidobacterium longum NCC3001 Reduces Depression Scores and Alters Brain Activity: a Pilot Study in Patients With Irritable Bowel Syndrome DOI: 10.1053/j.gastro.2017.05.003