Book excerpt: This book focuses on the nutrients and nutraceuticals that promote active and healthy ageing – recently defined by the WHO as the process of development and maintenance of functional capacity that allows well-being at an advanced stage of life. There has been a rapid rise in the use of nutritional interventions as well as specific nutraceuticals in the management of multifactorial aspects of clinical health outcomes. Written by leading experts this book comprehensively discusses the various ageing phenotypes and age-related diseases. It also assesses the nutritional status of the elderly and the various epidemiological factors that influence it. It reviews the role of dietary fiber in disease-free and fully functional ageing. Further, the book explores the benefits of polyphenols, which are secondary plant metabolites, in protecting against cancer, cardiovascular diseases, and various neurodegenerative diseases.