There is growing concern worldwide regarding the rising prevalence of overweight and obesity in children and adolescents whereby many of the adverse health effects associated with adult obesity are now being seen in adolescents. Of further concern is the strong tracking of adolescent weight into adulthood which has added consequences for long-term health. Whilst the prevention of overweight and obesity should be at the forefront, it is evident that effective treatment programs for already obese teens are urgently needed to prevent them from becoming obese adults. This book provides an overview of adolescent overweight/obesity and possible treatment options, before reporting on the results of a scientific trial utilising Cognitive Behavioural Therapy (CBT) to treat overweight and obese adolescents. The CBT program focussed on sustainable lifestyle changes to diet and activity to bring about improvements in weight status, body fat and dietary habits. Therefore, this book would provide a useful reference for health professionals, physical educators, researchers, academics or other individuals with an interest in obesity.