Childhood obesity has reached epidemic proportions in the United States and other industrialized nations. Despite the significant psychosocial consequences, mental health professionals have been reluctant to provide direct treatment for these children and their parents. The author proposes a practice model for agency, clinic, and private settings, with the mental health practitioner as primary clinician. On the basis of intervention research methodology, the model presents consensus generalizations and clinical applications for evaluation and treatment. A typology of diagnostic profiles with corresponding strategies for combining diet, activity, and mental health interventions is included.