Dr. Emeran Mayer, executive director of the Oppenheimer Center for Neurobiology of Stress and Resilience at UCLA, offers a cutting-edge view into this developing science, showing us the full impact and complexity of how the brain, gut, and microbiome -- the community of microorganisms that lives inside the digestive tract -- communicate with one another... When this communication channel is out of whack, major health problems can crop up in both the mind and the body, including food sensitivities and allergies, digestive disorders, obesity, depression, anxiety, and fatigue.