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  Heather Zwickey, PhD, is the dean of research and graduate studies and professor of immunology at the National College of Medicine, as well as the director of the Helfgott Research Institute. In this interview with Natural Medicine Journal's Editor-in-Chief, Tina Kaczor, ND, FABNO, Zwickey explains how immune processes can influence brain health—including in Parkinson's, Alzheimer's, and depressive disorders. She discusses nutrition, supplements, and the complicated ways gut health and immunity interact with cognitive function. Approximate listening time: 20 minutes About the Expert Heather Zwickey, PhD, is dean of research and graduate studies and a professor of immunology at the National College of Natural Medicine, Portland, Oregon, as well as director of Helfgott Research Institute. Currently, she heads several pilot studies looking at the effects of botanicals, hydrotherapy, energy medicine, and diet on immunological parameters. Zwickey trained at the National Jewish Medical and Research Center in Denver, Colorado. She received her doctorate in immunology and microbiology from the University of Colorado Health Sciences Center and completed a postdoctoral fellowship at Yale University.