This comprehensive guide serves as an essential resource for understanding the fundamentals of nutrition, meal planning, and diet therapy. It offers detailed discussions on nutrients, energy metabolism, and disease-specific nutrition, making it relevant for various disciplines such as nursing, home science, and community health. Enhanced with practical illustrations, charts, and tables, the book simplifies complex topics for better comprehension. The appendices include dietary allowances, food composition tables, and a glossary, providing quick reference tools to enrich the reader's learning experience. The revised edition caters to the evolving needs of students and professionals by incorporating topics relevant to fields like education, art, social sciences, medical and paramedical sciences, agriculture, and pediatrics. Recognizing the inclusion of diet therapy in the curricula of several universities, the book has expanded its focus on this area, aligning with contemporary academic and professional requirements. This ideal textbook covers key aspects such as the study of nutrition, nutrients and energy, foods, meal planning and management, and diet therapy, ensuring it meets the diverse needs of its readers.