Anorexia Nervosa Nutritional Support Protocol

Anorexia nervosa is a serious eating disorder characterized by severe restriction of food intake, intense fear of weight gain, and distorted body image. It has the highest mortality rate of any psychiatric illness due to both medical complications and suicide. Chronic starvation leads to multiple nutritional deficiencies and medical complications affecting virtually every organ system, including heart, bones, brain, hormones, and immune system.

CRITICAL: Anorexia nervosa requires professional treatment including specialized psychotherapy (particularly Family-Based Treatment for adolescents and CBT-E for adults), nutritional rehabilitation, and medical monitoring. Refeeding must be done carefully to avoid potentially fatal refeeding syndrome. THIS IS NOT A CONDITION TO MANAGE WITH SUPPLEMENTS ALONE. Professional treatment at an eating disorder program is essential. These supplements address nutritional deficiencies that develop but don't treat the underlying psychiatric illness.

* Zinc deficiency is nearly universal in AN and contributes to loss of appetite and taste changes. Zinc supplementation has been shown to improve rate of weight gain and help restore normal appetite.

* Multi-Vitamin/Mineral supplementation addresses the multiple micronutrient deficiencies that develop with severe caloric restriction.

* Vitamin D deficiency is extremely common in AN patients. Combined with the hormonal changes from starvation, this contributes to severe bone loss. Many AN patients develop osteoporosis at young ages.

* Calcium is essential for bone health. AN causes significant bone loss that may not fully recover even after weight restoration.

* Omega-3 Fatty Acids are often deficient because AN patients typically restrict fat. These support brain health and mood.

* B Vitamins support energy metabolism and mood. Deficiencies can contribute to fatigue and depression.

* Magnesium is critical - deficiency can cause dangerous cardiac arrhythmias. Monitor closely during refeeding.

* Iron - anemia is common in AN and may require supplementation.

Expected timeline: Nutritional rehabilitation typically takes months to years. Zinc may improve appetite within weeks. Bone density improvement requires weight restoration and may take years. Psychological recovery often takes longer than physical recovery.

Clinical Perspective

Anorexia nervosa (DSM-5): restriction of energy intake leading to significantly low body weight, intense fear of gaining weight or behavior preventing weight gain, disturbance in body image. Subtypes: restricting, binge-eating/purging. Highest mortality of any psychiatric illness (5-10% per decade). Medical complications: bradycardia, arrhythmias, hypotension, hypothermia, osteoporosis, amenorrhea, cytopenias, electrolyte abnormalities, GI dysmotility, brain changes.

CRITICAL: Requires multidisciplinary treatment - psychiatry/psychology, medicine, nutrition. Psychotherapy: FBT (Family-Based Treatment) gold standard for adolescents; CBT-E for adults. Inpatient for medical instability or severe malnutrition. REFEEDING SYNDROME risk: monitor phosphorus, magnesium, potassium - start low, advance slowly. No FDA-approved medications for AN (olanzapine may help). Supplements address deficiencies but DON'T TREAT the psychiatric illness.

* Zinc (B-grade): Deficiency common, affects appetite and taste. Controlled trial: zinc improved weight gain rate (PMID: 8452767). Systematic review supports use (PMID: 12221654). 15-30mg daily.

* Multi-Vitamin/Mineral (B-grade): Multiple deficiencies develop. Review: micronutrient assessment important (PMID: 16717171). High-potency multivitamin daily.

* Vitamin D (B-grade): Deficiency ~90% in AN; bone health critical. Systematic review: common and undertreated (PMID: 25110281). 2000-4000 IU daily; higher if severely deficient.

* Calcium (B-grade): Bone loss major concern - often doesn't fully recover. Guidelines: 1000-1500mg daily (PMID: 26040902). Diet + supplements.

* Omega-3 Fatty Acids (C-grade): Brain development, mood. Review: EFA deficiency in eating disorders (PMID: 18072162). 1-2g EPA+DHA daily.

* B Vitamins (C-grade): Energy metabolism, mood. Review: deficiencies common (PMID: 16717171). B-complex daily.

* Magnesium (B-grade): CRITICAL - deficiency causes arrhythmias. Review: electrolyte abnormalities common (PMID: 18167525). 300-400mg daily; monitor in refeeding.

* Iron (B-grade): Anemia common. Review: hematological abnormalities in AN (PMID: 23219730). Supplement based on iron studies.

Biomarker targets: BMI (goal: healthy weight), electrolytes (K, Mg, Phos), CBC, metabolic panel, vitamin D, ferritin, bone density (DXA).

Protocol notes: Refeeding syndrome: start 10-20 kcal/kg/day, advance slowly. Check phosphorus, magnesium, potassium frequently. Supplement phosphorus prophylactically. ECG monitoring for QTc prolongation. Inpatient criteria: <75% IBW, vital sign instability, medical complications, psychiatric emergency. FBT phases: parents control eating, gradual return of control, identity development. CBT-E: 4-stage outpatient treatment. Olanzapine may help with anxiety around eating. SSRIs not helpful for acute AN (may help after weight restoration). Estrogen doesn't restore bone density without weight restoration. Gastroparesis common - small frequent meals. Treat constipation. Long-term prognosis: 50% recover, 30% improve, 20% chronic. Suicide risk elevated. Comorbidity: depression, anxiety, OCD common. Family involvement crucial. Support groups. Address perfectionism, cognitive rigidity. Exercise restrictions initially.

View All Protocols