The second episode of Catalyst's "Gut Reaction: Let Food Be Thy Medicine" builds on the investigation of gut bacteria, focusing on how dietary choices can function as a form of preventative medicine. Dr. Graham Phillips explores the science behind how specific foods can foster the growth of beneficial gut bacteria, which in turn may help prevent or manage a range of conditions, from diabetes and multiple sclerosis to mental health disorders. This episode features engaging experiments that illustrate the positive effects of high-fiber, whole-food diets on gut microbiota and overall health. Dr. Phillips also delves into the roles of probiotics and prebiotics, discussing their significance in maintaining a balanced and healthy digestive system. By highlighting the transformative impact of nutrition, the episode emphasizes the potential of food to serve as a powerful tool for enhancing health and preventing disease.