Metabolism is the process whereby food is converted into energy by living organisms. This book on nutrition and metabolism deals with topics related to physical activity and metabolism as well as the chemical reactions that occur during the metabolic process. Metabolic activity changes according to the requirement of energy by cells. This book is a valuable compilation of topics ranging from the basic to the most complex advancements in the field of nutrition and metabolism. For all readers who are interested in these fields the research included in this book will serve as excellent guide to develop a comprehensive understanding. It will serve as a reference to a broad spectrum of readers.