The leading clinical reference work in the field--now significantly revised with 85% new material--this handbook gives practitioners and students a comprehensive understanding of the causes, consequences, and management of adult and childhood obesity.In concise, extensively referenced chapters from preeminent authorities, the Handbook presents foundational knowledge and reviews evidence-based psychosocial and lifestyle interventions as well as pharmacological and surgical treatments.It provides guidelines for conducting psychosocial and medical assessments and for developing individualized treatment plans.The effects of obesity--and of weight loss--on physical and psychological well-being are reviewed, as are strategies for helping patients maintain their weight loss. New to This Edition *Many new authors and topics; extensively revised and expanded with over 15 years of research and clinical advances, including breakthroughs in understanding the biological regulation of appetite and body weight. *Section on contributors to obesity, with new chapters on food choices, physical activity, sleep, and psychosocial and environmental factors. *Chapters on novel treatments for adults--acceptance and commitment therapy, motivational interviewing, digitally based interventions, behavioral economics, community-based programs, and nonsurgical devices. *Chapters on novel treatments for children and adolescents--school-based preventive interventions, family-based behavioral weight loss treatment, and bariatric surgery. *Chapters on the gut microbiome, the emerging field of obesity medicine, reimbursement for weight loss therapies, and managing co-occurring eating disorders and obesity.