Gut microbiota plays a crucial role in preventing cancer by influencing the immune system, regulating inflammation, and producing beneficial metabolites. This book is a comprehensive guide to understanding the role of gut microbiota in human health. It presents the latest research on gut microbiota, from the characterization of different microbial species to their functions in food conversion and cancer prevention. It sheds light on the diverse composition of gut microbiota, identified through DNA sequencing technology, and how it is influenced by various factors such as diet, genetics, and lifestyle. It highlights promising research on how gut microbiota can be manipulated to prevent health disorders. It is a must-read for anyone interested in understanding the complex and dynamic relationship between gut microbiota and human health.