Supporting Immune Health in Anorexia Nervosa: A Clinical Guide

Anorexia nervosa (AN) causes profound immunodeficiency due to malnutrition, hormonal dysregulation, and organ atrophy. Immune support is integral to medical stabilization and recovery.

Nutritional Rehabilitation (Cornerstone)

• Refeeding Syndrome Prevention: Start low-calorie (10–20 kcal/kg/day), advance slowly under medical monitoring. Correct electrolytes (phosphate, potassium, magnesium) aggressively.
• Protein: 1.2–1.5 g/kg/day for immune cell synthesis, wound healing.
• Micronutrients: Zinc (30–50 mg/day), Vitamin D (2000–5000 IU to maintain 40–60 ng/mL), Vitamin C (500–1000 mg), Selenium, Vitamin A, B12, folate. Only supplement under medical supervision—refeeding shifts electrolytes; fat-soluble vitamins accumulate.
• Omega-3 Fatty Acids: Anti-inflammatory, support mucosal immunity.

Lifestyle & Medical Management

• Sleep: 7–9 hours. Melatonin if needed. Sleep deprivation worsens immune function.
• Graded Exercise: Only after medical clearance and weight restoration. Start with gentle yoga/walking. Avoid compulsive exercise.
• Stress Reduction: CBT-E, DBT, mindfulness. Chronic stress elevates cortisol → immunosuppression.
• Smoking Cessation: Smoking impairs mucosal immunity, wound healing.
• Vaccinations: Update per CDC schedule (inactivated vaccines safe; live vaccines deferred if severely immunocompromised). Annual flu, COVID-19, pneumococcal, HPV.
• Treat Comorbidities: Depression, anxiety, OCD with therapy ± SSRIs.

Monitoring

Regular CBC with differential (ANC), immunoglobulins (IgG, IgA, IgM), lymphocyte subsets, vaccine titers. Bone density (DEXA) for osteopenia.

Critical: AN has the highest mortality of any psychiatric illness. Treatment requires a specialized multidisciplinary team (physician, dietitian, therapist, psychiatrist). Never attempt aggressive refeeding or supplementation without medical supervision.