Summary: Dr. Chris Lowry explores his cutting-edge research on the interplay between the diversity of microbiome in the gut and mental and physical health. He is currently researching an injectable form of M. vaccae, which can act as an inflammatory reducing agent in the body, in turn, reducing symptoms in conditions such as PTSD. He points out how living in overly-sterilized nations reduces our exposure to “old friends” and what this means for the future of our health.