Biochemistry is the study of chemical processes within and relating to living organisms. Biochemical processes give rise to complexity of life. Biochemistry deals with the structures, functions and interactions of biological macromolecules, such as proteins, nucleic acids, carbohydrates and lipids, which provide the structure of cells and perform many functions of life. This book offers a comprehensive coverage of biochemical systems, structures, and metabolic reactions within the organism while emphasizing on the nutritional aspects of biochemicals. The chapters are designed such that it covers all the concepts from the basic to the complex, to help the students understand key concepts and appreciate the significant connections among biochemistry, physiology, nutrition and human health. In this text, individual disciplines are treated in an integrated manner to provide sound foundation in the subject. The book is particularly meant for the students from undergraduate and postgraduate courses in life sciences, health sciences, pharmaceutical sciences and other related fields, since it gives fundamental knowledge of biochemistry and explains well the metabolic and physiological roles of biomolecules.