This document discusses obesity, including its definitions, classifications, prevalence, physiology, and management. It provides guidelines for clinicians on their role in weight loss, including counseling strategies to promote behavior change. New guidelines for obesity management are presented, along with selecting appropriate medications based on a patient's comorbidities. Surgical and non-surgical procedures for obesity are outlined, along with expected weight loss and vitamin deficiencies. The role of nutrition, physical activity, behavior therapy, and medical therapy in obesity treatment is also examined.