This book contains maximum ten chapters indicating the role of different phtyochemicals in management/treatment of human diseases (diabetes, obesity, etc.). Up-to-date review of recent research articles will be available in each of the chapters. The extraction methods of phytochemicals, their bioavailability will be discussed in details. The chapters are written by eminent faculty members who are working in the related field for a long time. This book will be a ready reference for the post-graduate students, researchers, scientists who are working with phyto-pharmaceuticals and drug designing. There are a variety of medicinal plant which are mostly found in and around Indian Subcontinent and which have a diverse range of impact on human health. This book will be an asset to the universities and research centres to use as a quick guide to study the roles of phytochemicals on human physiology.