This essay provides a detailed biopsychosocial assessment of an eating disorder, specifically anorexia nervosa, through the analysis of a case study involving a 19-year-old girl named Charlie. It identifies biological, psychological, and social factors contributing to the disorder, including genetic predispositions, neurobiological imbalances, and social pressures. The essay also discusses appropriate nursing management and interventions, such as refeeding protocols, addressing anxiety and disturbed body image, and setting realistic eating goals. Furthermore, it addresses ethical dilemmas in treating eating disorders, such as counselor competence and the implications of self-disclosure. The essay emphasizes the importance of a therapeutic relationship between nurses and patients and concludes by highlighting the increasing prevalence of eating disorders among young women and the need for comprehensive care.