The 6th Symposium on Nutritional Aspects of Osteoporosis confirmed that the field of nutritional influences on of bone health has become a very active, productive, and innovative scientific specialty, which justifies a periodic eview. Since the last meeting in 2003, new nutritional factors and aspects have been discovered, as e.g. the importance of vitamin D on muscle function and risk of fall, the interactions between proteins and calcium metabolism, the importance of the homocysteine system, and more information has been gathered on the role of the acid respectiely tha alkaline load of food on bone health. In this context have been further examined the influence of vitamin K, of potassium and bicarbonate, of fruits and vegetables. furthermore, new data were produced on the long-term efficacy of calcium or dairy products, or of proteins consumed in childhood. This volume presents the major presentations of the symposium. It offers the opportunity to review several segments of the growing field of nutritional research.