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 nonalcoholic 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.