The 3rd edition has been completely revised to include important current topics and chapters, such as the inclusion of eating disorders in ICD 11/DSM 5, the role of the microbiome and the role of modern media e.g. ehealth in prevention and treatment. In addition, the editors and authors address, among other topics, systemic therapy as a new evidence-based psychotherapy and the discussion of addiction mechanisms in eating and weight disorders, and provide an outlook on the role of neurostimulation procedures to address current developments in obesity and eating disorders.