Human Microbiome in Health and Disease, Volume 191, Part A presents updated knowledge on human microbiome as covered by renowned science faculty across the globe. Chapters in this volume include an introduction to human microbiome, Structure, functions and diversity of healthy human microbiome, Role of human microbiome in cancer, Gut microbiota and gastrointestinal cancer, Dysbiosis of human microbiome and metabolic diseases, Gut microbiome and type 2 diabetes, Gut microbiome and non-alcoholic fatty liver disease, Hepatic drug metabolism and intestinal microbiota, Emerging tools for understanding the human microbiome, and Microbiome therapeutics: Opportunity and challenges, and more. These chapters cover the composition, diversity, dynamics and functions of human microbiome in health and disease. This book will form an excellent and informative text on keystone, autochthonous, and exogenous microbiota important for human health in a simple to understand and easy to read format.