Gastroenterologist Dr. Roshini Raj shows the ways in which the microbiome - a community of bacteria, viruses, and yeasts that dwell in the body - impacts overall well-being. Dr. Raj offers simple and straightforward answers to questions like what one should be eating, what probiotics are, which vitamins and medicines really work. She uses the idea of a home renovation to show how different organs and parts of the body can be "renovated" in order to optimize the microbiome. Dr. Raj helps readers reset their biological clocks by improving their gut health.