Nutritional status and nutritional requirement are explored using a life span model. From a multiple determinant perspective, nutrition is positioned as a significant factor affecting health at each life stage. The importance of nutrition on the developing foetus, and its impact on development of chronic disease in later life is reviewed in the context of available literature. Emphasis is placed on nutrient requirements, adaptation, growth and development as well as current areas of research and controversy at each stage of the life cycle. Areas of emphasis include feeding and eating principles, high risk populations, women's health needs, and nutrition challenges presented by our aging society. Relevant health and education policy, program and evaluation strategies are presented.