The "Handbook of Clinical Nutrition and Aging" in its third, completely revised edition is a comprehensive reference book that is considered a benchmark in the field of nutrition and aging. The editors, who are experts in geriatric nutrition, medical sociology, and clinical nutrition, have added numerous new chapters and thoroughly updated the content of the previous edition. This edition provides current perspectives and the latest scientific and clinical developments regarding the interaction between nutrition and age-related diseases. It is aimed at professionals working in the healthcare of the growing elderly population and offers evidence-based options for promoting health and preventing disease. The topics covered range from the role of nutrition in physical and cognitive function to clinical conditions such as obesity, diabetes, and osteoporosis, and also include aspects such as food security and dietary supplements.