This compelling book on health, wellbeing, and fulfilment investigates the scientific basis of what we think we know about healthy living. How much do we actually know about the information that is presented as fact by health crusaders and in the media? How do perceptions of truth and validity influence our behaviour and our health? Guided by the author's practice in academic and non-profit medicine, this book highlights the practical impact of scientific studies in a broad range of disciplines and brings to life their relevance and limitations. It presents a journey of discovery that includes the foundations of knowledge, factors of health, implications of lifestyle choices, positive psychology, and social science. The book takes a realistic look at the evidence of biological, psychological, and cultural determinants of health, and is essential reading for anyone who wonders why there is so much left to learn about what truly enhances wellbeing and survival. It is an empowering book that provides a key to understanding how we can all improve and support our health to thrive in any phase of life.