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Emergency And Acute Medicine - Eating Disorder
Foundational Overview
Eating disorders are complex psychiatric illnesses with significant medical morbidity and mortality.
Anorexia nervosa is defined by restriction of energy intake resulting in markedly low body weight for age, sex, or developmental trajectory, accompanied by an intense fear of weight gain and a disturbed perception of body image or denial of illness severity. Lifetime prevalence in U.S. females is approximately 0.5%, with bimodal onset peaks at ages 13–14 and 17–18 years.
Bulimia nervosa is characterized by recurrent binge-eating episodes involving consumption of unusually large amounts of food with loss of control, followed by compensatory behaviors such as self-induced vomiting, misuse of laxatives, diuretics, diet pills, fasting, or excessive exercise. These behaviors occur at least weekly for three months, with self-evaluation overly influenced by weight or shape. Lifetime prevalence is about 2% of U.S. females, typically beginning in late adolescence or early adulthood.
Binge eating disorder involves recurrent binge-eating episodes with loss of control, associated with marked distress and at least three characteristic behaviors such as rapid eating, eating until uncomfortably full, eating when not hungry, eating alone due to embarrassment, or feelings of guilt and disgust afterward. Episodes occur at least weekly for three months without compensatory behaviors. Lifetime prevalence is approximately 3.5% in females and 2% in males, with onset in late adolescence or early adulthood.
Underlying Causes And Contributing Factors
Twin studies support a strong genetic contribution. Sociocultural emphasis on thinness, personality traits such as perfectionism and rigidity, family stress, and dieting as a precipitating factor are common. Neurochemical and neuroendocrine abnormalities involving serotonin, leptin, and the hypothalamic–pituitary–adrenal axis have been described.
Clinical Presentation
Patients may report rapid or sustained weight loss, restrictive eating, bingeing, purging behaviors, excessive exercise, dizziness, syncope, bloating, constipation, abdominal pain, fatigue, palpitations, cold intolerance, amenorrhea, or loss of libido. A family history of eating disorders or obesity and comorbid psychiatric illness are common.
Physical Examination Findings
Findings may include weight less than 85% of ideal body weight or BMI below 17.5 in anorexia nervosa, hypothermia, hypotension with orthostasis, bradycardia or arrhythmias, dry skin, lanugo, carotenoderma, breast atrophy, parotid or submandibular swelling, abnormal dentition, abrasions on the dorsum of the hand, poor wound healing, peripheral edema, and proximal muscle weakness.
Core Evaluation Strategy
Assessment includes a detailed history, focused physical examination, nutritional assessment, and psychiatric evaluation with suicide risk assessment. Psychosocial context and family dynamics should be explored, particularly in adolescents.
Diagnostic Studies And Interpretation
Laboratory testing may reveal cytopenias, electrolyte disturbances such as hypokalemia, hyponatremia, hypoglycemia, metabolic alkalosis, renal dysfunction, hypocalcemia, hypomagnesemia, hypophosphatemia, hypoalbuminemia, and hepatic enzyme abnormalities. Urinalysis with specific gravity, toxicology screening, pregnancy testing, amylase and lipase levels, and thyroid-stimulating hormone may be useful. ECG may show QTc prolongation or arrhythmias. Consider echocardiography for suspected cardiomyopathy, bone density testing for osteoporosis, and targeted imaging to exclude alternative diagnoses when indicated.
Conditions To Distinguish From Eating Disorders
Medical causes include gastrointestinal disease, endocrine disorders, malignancy, and chronic infection. Psychiatric differentials include mood disorders, obsessive–compulsive disorder, borderline personality disorder, and substance use disorders.
Immediate Stabilization Principles
Initial management prioritizes airway, breathing, and circulation. Fluids should be administered cautiously to avoid precipitating edema. Correct hypoglycemia, electrolyte abnormalities, and vitamin deficiencies, particularly phosphate and thiamine, to prevent refeeding syndrome. Active warming may be required for hypothermia.
Emergency Department Management
Care focuses on medical stabilization and early psychiatric consultation, including evaluation for suicidality and comorbid psychiatric conditions.
Pharmacologic Considerations
No medication has proven efficacy for anorexia nervosa itself, though small studies suggest potential benefit of atypical antipsychotics such as olanzapine. Fluoxetine is FDA approved for bulimia nervosa and reduces binge–purge behavior; other SSRIs and selected antidepressants may be used. Evidence supports antidepressants and topiramate for binge eating disorder. Pharmacotherapy should be used alongside psychotherapy.
Disposition And Level Of Care Decisions
Admission is indicated for severe medical instability, including extremely low body weight, rapid weight loss, significant electrolyte abnormalities, bradycardia, hypotension, orthostasis, hypothermia, arrhythmias, or organ dysfunction. Psychiatric admission is required for suicidality, severe depression or psychosis, lack of treatment cooperation, or failure of outpatient care. Discharge is appropriate only when the patient is medically and psychologically stable with a multidisciplinary outpatient plan in place.
Follow-Up And Ongoing Care
Effective outpatient management requires a coordinated team including a physician, mental health professional, nutritionist, and often family or group therapy support. Monitoring includes vital signs, weight trends, electrolytes, ECGs, dietary intake, and exercise behaviors. Psychotherapy—particularly cognitive behavioral therapy and family-based treatment—is central. Pharmacologic therapy is adjunctive and targeted to comorbid conditions.
Key Clinical Insights And Common Errors
Eating disorders carry high medical and suicide risk, making safety assessment paramount. Rapid nutritional repletion without electrolyte and vitamin replacement can cause fatal refeeding syndrome. Avoid confrontational approaches that reinforce obsessive thinking. Optimal outcomes depend on early recognition and coordinated multidisciplinary care.
Foundational Overview
Eating disorders are complex psychiatric illnesses with significant medical morbidity and mortality.
Anorexia nervosa is defined by restriction of energy intake resulting in markedly low body weight for age, sex, or developmental trajectory, accompanied by an intense fear of weight gain and a disturbed perception of body image or denial of illness severity. Lifetime prevalence in U.S. females is approximately 0.5%, with bimodal onset peaks at ages 13–14 and 17–18 years.
Bulimia nervosa is characterized by recurrent binge-eating episodes involving consumption of unusually large amounts of food with loss of control, followed by compensatory behaviors such as self-induced vomiting, misuse of laxatives, diuretics, diet pills, fasting, or excessive exercise. These behaviors occur at least weekly for three months, with self-evaluation overly influenced by weight or shape. Lifetime prevalence is about 2% of U.S. females, typically beginning in late adolescence or early adulthood.
Binge eating disorder involves recurrent binge-eating episodes with loss of control, associated with marked distress and at least three characteristic behaviors such as rapid eating, eating until uncomfortably full, eating when not hungry, eating alone due to embarrassment, or feelings of guilt and disgust afterward. Episodes occur at least weekly for three months without compensatory behaviors. Lifetime prevalence is approximately 3.5% in females and 2% in males, with onset in late adolescence or early adulthood.
Underlying Causes And Contributing Factors
Twin studies support a strong genetic contribution. Sociocultural emphasis on thinness, personality traits such as perfectionism and rigidity, family stress, and dieting as a precipitating factor are common. Neurochemical and neuroendocrine abnormalities involving serotonin, leptin, and the hypothalamic–pituitary–adrenal axis have been described.
Clinical Presentation
Patients may report rapid or sustained weight loss, restrictive eating, bingeing, purging behaviors, excessive exercise, dizziness, syncope, bloating, constipation, abdominal pain, fatigue, palpitations, cold intolerance, amenorrhea, or loss of libido. A family history of eating disorders or obesity and comorbid psychiatric illness are common.
Physical Examination Findings
Findings may include weight less than 85% of ideal body weight or BMI below 17.5 in anorexia nervosa, hypothermia, hypotension with orthostasis, bradycardia or arrhythmias, dry skin, lanugo, carotenoderma, breast atrophy, parotid or submandibular swelling, abnormal dentition, abrasions on the dorsum of the hand, poor wound healing, peripheral edema, and proximal muscle weakness.
Core Evaluation Strategy
Assessment includes a detailed history, focused physical examination, nutritional assessment, and psychiatric evaluation with suicide risk assessment. Psychosocial context and family dynamics should be explored, particularly in adolescents.
Diagnostic Studies And Interpretation
Laboratory testing may reveal cytopenias, electrolyte disturbances such as hypokalemia, hyponatremia, hypoglycemia, metabolic alkalosis, renal dysfunction, hypocalcemia, hypomagnesemia, hypophosphatemia, hypoalbuminemia, and hepatic enzyme abnormalities. Urinalysis with specific gravity, toxicology screening, pregnancy testing, amylase and lipase levels, and thyroid-stimulating hormone may be useful. ECG may show QTc prolongation or arrhythmias. Consider echocardiography for suspected cardiomyopathy, bone density testing for osteoporosis, and targeted imaging to exclude alternative diagnoses when indicated.
Conditions To Distinguish From Eating Disorders
Medical causes include gastrointestinal disease, endocrine disorders, malignancy, and chronic infection. Psychiatric differentials include mood disorders, obsessive–compulsive disorder, borderline personality disorder, and substance use disorders.
Immediate Stabilization Principles
Initial management prioritizes airway, breathing, and circulation. Fluids should be administered cautiously to avoid precipitating edema. Correct hypoglycemia, electrolyte abnormalities, and vitamin deficiencies, particularly phosphate and thiamine, to prevent refeeding syndrome. Active warming may be required for hypothermia.
Emergency Department Management
Care focuses on medical stabilization and early psychiatric consultation, including evaluation for suicidality and comorbid psychiatric conditions.
Pharmacologic Considerations
No medication has proven efficacy for anorexia nervosa itself, though small studies suggest potential benefit of atypical antipsychotics such as olanzapine. Fluoxetine is FDA approved for bulimia nervosa and reduces binge–purge behavior; other SSRIs and selected antidepressants may be used. Evidence supports antidepressants and topiramate for binge eating disorder. Pharmacotherapy should be used alongside psychotherapy.
Disposition And Level Of Care Decisions
Admission is indicated for severe medical instability, including extremely low body weight, rapid weight loss, significant electrolyte abnormalities, bradycardia, hypotension, orthostasis, hypothermia, arrhythmias, or organ dysfunction. Psychiatric admission is required for suicidality, severe depression or psychosis, lack of treatment cooperation, or failure of outpatient care. Discharge is appropriate only when the patient is medically and psychologically stable with a multidisciplinary outpatient plan in place.
Follow-Up And Ongoing Care
Effective outpatient management requires a coordinated team including a physician, mental health professional, nutritionist, and often family or group therapy support. Monitoring includes vital signs, weight trends, electrolytes, ECGs, dietary intake, and exercise behaviors. Psychotherapy—particularly cognitive behavioral therapy and family-based treatment—is central. Pharmacologic therapy is adjunctive and targeted to comorbid conditions.
Key Clinical Insights And Common Errors
Eating disorders carry high medical and suicide risk, making safety assessment paramount. Rapid nutritional repletion without electrolyte and vitamin replacement can cause fatal refeeding syndrome. Avoid confrontational approaches that reinforce obsessive thinking. Optimal outcomes depend on early recognition and coordinated multidisciplinary care.
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