We are grateful to W. Philip T. James (International Obesity Task Force, London, United Kingdom) and Kaare R. Norum (University of Oslo, Norway) for reviews of and suggestions on early drafts of this book, Shubhada Watson (Evidence on Health Needs, WHO Regional Office for Europe) for helping to assess the evidence base, and to Garden Tabacchi (University of Palermo, Italy) for overall editorial assistance in completing the final manuscript.