Dr. Robert Silverman, a chiropractic doctor, clinical nutritionist, national/international speaker and author of Amazon’s #1 bestseller, “Inside-Out Health,” as he discusses - The microbiome—the teeming community of trillions of bacteria in your colon—plays a central role in both a healthy digestive system and a healthy brain. The two are connected through your body's complex immune system. When the gut microbiome is out of balance, the immune impacts can affect not just digestion but also the brain.