This textbook explains the basic principles of Biochemistry, Nutrition and Dietetics and their application to health and disease. It presents core information to introduce basic concepts and thereby apply the acquired knowledge in nursing practice. Third edition is comprehensively updated to meet the constantly changing health needs of people. Content has been reorganized and significant changes have been made during the development of the text to include addition of a new section on biochemistry and recent updates in the Nutrition section as per the revised syllabus outlined by the Indian Nursing Council.