anorexia nervosa

anorexia nervosa. It is a serious mental disorder characterized by an intense fear of gaining weight and a distorted body image, leading to severe food restriction and dangerously low body weight. The condition has one of the highest mortality rates of any psychiatric illness, often resulting from medical complications or suicide. Its management typically requires a multidisciplinary approach involving psychiatry, internal medicine, and nutritional science.

Signs and symptoms

Core physical signs include extreme emaciation, fatigue, dizziness, and the development of fine hair known as lanugo. Cardiovascular complications such as bradycardia, hypotension, and arrhythmia are common and can be life-threatening. Behavioral symptoms often involve obsessive rituals around food, excessive exercise, and social withdrawal. Psychological features consistently include a pervasive fear of weight gain and a profoundly distorted perception of one's own body shape and size, despite objective evidence to the contrary.

Causes and risk factors

The etiology is multifactorial, involving a complex interplay of genetic predisposition, neurobiological factors, and environmental influences. Twin studies and family studies have shown a significant heritable component, with particular interest in genes related to serotonin and dopamine pathways. Sociocultural pressures, often amplified by media and industries like fashion, contribute to risk, particularly during adolescence. Certain personality traits such as perfectionism and obsessive-compulsive tendencies, as well as participation in activities like ballet or gymnastics, are recognized risk factors.

Diagnosis

Formal diagnosis is based on criteria outlined in the Diagnostic and Statistical Manual of Mental Disorders, which includes restriction of energy intake leading to significantly low body weight, an intense fear of gaining weight, and disturbance in self-perceived weight or shape. Clinicians must rule out other medical conditions such as inflammatory bowel disease, hyperthyroidism, or malignancy. A comprehensive assessment typically involves a physical examination, blood tests, and a detailed psychiatric evaluation to assess comorbid conditions like major depressive disorder or anxiety disorders.

Treatment

The primary goals are weight restoration and addressing the underlying psychological pathology. Nutritional rehabilitation is often the first step, sometimes requiring hospitalization at facilities like the Maudsley Hospital or Stanford University clinics. Psychotherapy, particularly family-based therapy and cognitive behavioral therapy, forms the cornerstone of psychological treatment. In some cases, medications such as olanzapine or selective serotonin reuptake inhibitors may be used adjunctively to manage anxiety or comorbid depression. Long-term follow-up care is essential to prevent relapse.

Prognosis and epidemiology

The course is often chronic and relapsing, with recovery rates varying widely; long-term studies, such as those from the Massachusetts General Hospital, indicate that only about half of individuals achieve full recovery. Mortality is significantly elevated, with common causes including cardiac arrest, electrolyte imbalance, and suicide. It is most prevalent among adolescents and young adults in Western societies, with a higher incidence in females, though rates in males and across diverse cultures, as noted by organizations like the World Health Organization, are increasingly recognized. The incidence appears to have increased in recent decades in regions like North America and Western Europe. Category:Psychiatric diagnosis Category:Eating disorders Category:Mental health