This chapter explores the role of psychological interventions within a political and social context. It outlines the lifestyle policy in the UK since the 1990s and how this Impacts on the ethics of intervention and individual practice. Lifestyle policy clearly aims to direct cultural trends but Is Itself a product of our history and culture. The government has set many targets around reducing the incidence of lifestyle diseases and their main strategy to achieve the goals is to Increase healthy and decrease unhealthy lifestyle choices. It is Important that the healthcare professional recognises the key role of public policy in the promotion of healthy lifestyle and their individual practice. Finally, the chapter presents an overview of this book. The book explores how psychology can explain such behaviours and how it can be used to modify unsafe practices.