Dr. Raphael Kellman is an internist and functional medicine physician and founder of the Kellman Wellness Center in New York City. He is a graduate of Albert Einstein College of Medicine and pioneered a groundbreaking new brand of medicine and healing called "Microbiome Medicine." Dr. Kellman is the author of the best-selling "Microbiome Diet," "The Microbiome Breakthrough," and his latest release, "Microbiome Thyroid." Follow him on Twitter: @doctorkellman