Quick answer: Eating disorders and substance use disorders can occur together and may intensify each other’s medical and psychological risks. A 2019 meta-analysis of 43 studies estimated that 21.9% of people with an eating disorder had a lifetime substance use disorder and 7.7% had a current one, but the estimates varied substantially across studies. The safest approach is coordinated care that screens for and treats both conditions while addressing the most urgent medical risk first.
Evidence reviewed: August 15, 2026.
Eating disorders and substance use: key points
- Neither condition is a choice or a failure of willpower, and both are treatable.
- Co-occurrence is more common in binge-purge presentations than in restricting-only presentations, although anyone can be affected.
- Malnutrition, purging, dehydration, intoxication, withdrawal, and overdose can interact in dangerous ways.
- Appearance and body size cannot rule an eating disorder in or out.
- Experts recommend screening for both conditions and coordinating treatment rather than treating one in isolation.
- Research has not yet identified one best integrated protocol for every person, so treatment must be individualized.
What does co-occurring eating disorder and substance use disorder mean?
An eating disorder is a mental health condition involving persistent disturbances in eating or related behavior that impair health or functioning. Diagnoses include anorexia nervosa, bulimia nervosa, binge-eating disorder, avoidant/restrictive food intake disorder (ARFID), and other specified feeding or eating disorders.
A substance use disorder (SUD) is a clinically significant pattern of alcohol or other drug use that causes impairment or distress. Occasional substance use is not automatically an SUD; diagnosis considers features such as loss of control, craving, continued use despite harm, tolerance, and withdrawal.
When both are present, clinicians may call them co-occurring disorders. The older phrase “substance abuse” can sound stigmatizing and does not match current diagnostic language, so this article uses substance use or substance use disorder. For a broader primer, see our guide to substance use disorder symptoms, causes, and treatment.
It is also important not to diagnose by appearance or one symptom. Weight loss during stimulant use is not, by itself, anorexia nervosa; binge eating after intoxication is not, by itself, binge-eating disorder. A qualified clinician must assess the full pattern, its purpose, duration, distress, and health effects.
How common is the overlap?
The best pooled estimate remains imperfect. In a 2019 systematic review and meta-analysis of 43 studies, 21.9% of people with eating disorders had a lifetime SUD (95% confidence interval 16.7%–28.0%) and 7.7% had a current SUD (95% CI 2.0%–25.8%). Rates were higher in studies with more binge-purge presentations. The authors found marked differences among studies, so these figures are population estimates—not a prediction for an individual or a universal rate.
A separate 2021 systematic review and meta-analysis found SUDs in about 18% of people with anorexia nervosa binge-eating/purging type, compared with about 7% in the restricting type. Older research often overrepresented women and White treatment-seeking samples. Men, gender-diverse people, racial and ethnic minorities, people in larger bodies, and those outside specialist clinics may therefore be missed or misrepresented.
The overlap is not limited to illicit drugs. Alcohol, nicotine, cannabis, stimulants, sedatives, opioids, caffeine, and misused prescription or over-the-counter products can all be clinically relevant. The substance, dose, route, frequency, and reason for use matter.
Why can these conditions occur together?
There is no single pathway, and co-occurrence does not prove that one condition caused the other. Research points to interacting biological, psychological, and social influences, which may include:
- Emotion regulation: Restriction, bingeing, purging, or substance use may temporarily numb distress or change mood, reinforcing the behavior despite long-term harm.
- Reward, stress, and impulse-control systems: Shared vulnerabilities may affect craving, habit learning, compulsivity, and decision-making.
- Trauma and chronic stress: Trauma exposure is associated with both conditions for some people, but it is neither necessary nor sufficient to cause them. Learn more about the relationship between trauma symptoms and addiction.
- Weight- or appetite-control motives: Some people use stimulants, nicotine, caffeine products, laxatives, diuretics, or other substances in an attempt to alter appetite, weight, or shape.
- Social and environmental pressures: Weight stigma, discrimination, food insecurity, performance cultures, availability of substances, family stress, and limited access to affirming care may contribute.
- Other mental health conditions: Depression, anxiety, post-traumatic stress disorder, and attention-deficit/hyperactivity disorder can complicate assessment and recovery.
These are risk and maintenance factors, not moral failings. Our overview of the many possible causes of substance use disorder explains why simple “just stop” advice is rarely helpful.
Why the combination can be medically dangerous
Eating disorders can affect every organ system, even when a person’s weight appears “normal.” Substance effects, medication interactions, intoxication, and withdrawal can compound those risks.
Heart rhythm, fluid, and electrolyte problems
Vomiting, laxative or diuretic misuse, severe restriction, dehydration, and some substances can disturb potassium, sodium, magnesium, glucose, blood pressure, and heart rhythm. Warning signs include fainting, weakness, confusion, palpitations, chest pain, or seizures. These require prompt medical assessment rather than home management.
Malnutrition and refeeding risk
Someone who is severely malnourished may need medically supervised nutritional rehabilitation. Increasing nutrition too quickly without appropriate monitoring can trigger refeeding syndrome, a potentially fatal shift in fluids and electrolytes. The 2026 SAMHSA advisory on co-occurring SUDs and eating disorders recommends medical stabilization for severe malnutrition, dehydration, electrolyte abnormalities, abnormal vital signs, fainting, or loss of consciousness.
Intoxication, withdrawal, and overdose
Restriction and dehydration may change how a substance affects the body. Combining alcohol, opioids, sedatives, or other central-nervous-system depressants can suppress breathing. Abruptly stopping some substances can also be dangerous. The National Institute on Alcohol Abuse and Alcoholism warns that suddenly stopping after prolonged heavy drinking can cause potentially life-threatening withdrawal, including seizures.
After a period of abstinence, tolerance to opioids can fall, increasing fatal-overdose risk if use resumes. A clinician can help create an overdose-prevention plan, including naloxone access where appropriate and locally available.
Self-harm and suicide risk
Both eating disorders and SUDs are associated with elevated suicide risk, and intoxication can reduce inhibition. Ask directly about suicidal thoughts during assessment. If a person has intent, a plan, access to lethal means, or cannot stay safe, contact local emergency or crisis services immediately. In the United States and its territories, call or text 988; elsewhere, use the local crisis line or emergency number.
Signs that both conditions may need assessment
One sign does not establish a diagnosis. A pattern, increasing severity, or interference with daily life is what should prompt a professional evaluation.
- Using alcohol, stimulants, nicotine, caffeine products, laxatives, diuretics, or other substances to suppress appetite, change weight, compensate for eating, or tolerate hunger
- Bingeing or purging more often while intoxicated, during withdrawal, or after substance use
- Skipping meals before drinking, sometimes called “drunkorexia”—a nonmedical term for a dangerous behavior, not a diagnosis
- Secretive eating or substance use, disappearing after meals, missing medications, or rapidly changing routines
- Craving, loss of control, unsuccessful efforts to cut down, or continued use despite physical, relational, school, or work problems
- Dizziness, fainting, dental damage, gastrointestinal symptoms, menstrual or hormonal changes, sleep disruption, or unexplained injuries
- Increasing shame, isolation, anxiety, depression, trauma symptoms, self-harm, or suicidal thinking
Screening questionnaires can open a conversation, but they are not diagnostic and may perform differently across populations. A good evaluation does not rely on body mass index alone. To reduce common misconceptions, read 10 myths and facts about eating disorders.
What a thorough assessment should cover
A clinician should ask about eating patterns, restriction, bingeing, compensatory behaviors, exercise, body-image concerns, and use of alcohol, nicotine, drugs, prescription medicines, supplements, caffeine, laxatives, or diuretics. Useful details include quantity, frequency, route, last use, tolerance, withdrawal history, overdose history, and whether substances are used for appetite or weight control.
Depending on the situation, medical assessment may include vital signs lying and standing, hydration status, laboratory tests, an electrocardiogram, medication review, pregnancy considerations, and a physical examination. It should also assess suicide risk, trauma, co-occurring conditions, social supports, food access, housing, and barriers to care.
Be candid with the care team even if a behavior feels embarrassing. Withholding purging, restriction, or substance details can make nutrition, detoxification, and medication plans less safe.
What treatment is supported by evidence?
The central principle is coordinated care. SAMHSA’s 2026 advisory recommends screening for and treating both disorders concurrently, while first addressing whichever problem poses the most immediate threat to life or safety. Ideally, one multidisciplinary plan connects medical monitoring, eating-disorder psychotherapy, nutrition care, and SUD treatment.
The team may include a physician or advanced-practice clinician, an eating-disorder therapist, an addiction specialist, and a registered dietitian with relevant training. Family members or other chosen supports can be included with the person’s consent. If separate services are used, they should exchange information—with permission—and agree on medication, nutrition, exercise, safety, and return-to-use plans.
1. Medical stabilization comes first when needed
Severe malnutrition, unstable vital signs, dehydration, electrolyte abnormalities, fainting, acute intoxication, dangerous withdrawal, overdose risk, or imminent suicide risk may require emergency or inpatient care. Detoxification alone is not complete SUD treatment, and nutritional stabilization alone is not complete eating-disorder treatment; both should connect to ongoing care.
2. Eating-disorder treatment should match the diagnosis and age
The National Institute of Mental Health describes treatment as a combination of psychotherapy, medical monitoring, nutrition counseling, and—when appropriate—medication. Evidence-supported approaches include eating-disorder-focused cognitive behavioral therapy for many adults, family-based treatment for many adolescents and young adults with anorexia nervosa or bulimia nervosa, and cognitive behavioral therapy or interpersonal psychotherapy for binge-eating disorder. The exact approach depends on diagnosis, age, medical status, preference, culture, and available support.
Exercise should not be prescribed as a generic recovery strategy. When malnutrition, compulsive exercise, purging, or cardiac symptoms are present, movement may need to pause or be modified until a clinician clears it.
3. Substance use treatment should match the substance and severity
Evidence-based SUD care can include motivational interviewing, cognitive behavioral approaches, contingency management, recovery supports, and medication for some substances. According to the National Institute on Drug Abuse, SUDs are treatable chronic conditions, and co-occurring conditions are usually best treated at the same time. Medication options and withdrawal risks differ by substance, so a prescriber should individualize the plan.
Learning to identify substance-use triggers and practicing strategies for managing cravings can support a formal treatment plan, but self-help is not a substitute for medical care when withdrawal, malnutrition, or overdose risk is present.
4. Skills and trauma care can be useful adjuncts
Dialectical behavior therapy skills may help with emotion regulation, distress tolerance, and self-harm risk. Trauma-informed care should promote choice, safety, and collaboration. Intensive trauma processing is generally deferred until eating-disorder and substance-use symptoms are sufficiently stable and the person has coping support. Brief grounding techniques can help with distress, but they do not replace trauma therapy or emergency care.
5. The evidence has important limits
There is no single, well-established integrated protocol proven best for every combination of eating disorder and SUD. Trials often exclude medically unstable people or those with complex co-occurring conditions, and many samples lack demographic diversity. Digital programs and peer-support groups may improve access or reinforce skills, but evidence for treating both disorders together is limited. They should complement—not replace—qualified clinical care.
Which level of care is appropriate?
Care may range from coordinated outpatient treatment to intensive outpatient, partial hospitalization, residential, medical inpatient, or hospital-based withdrawal management. The correct level depends on medical stability, suicide and overdose risk, withdrawal history, frequency of eating-disorder behaviors, ability to eat safely, available support, and response to prior care—not body size alone.
When comparing programs, ask:
- Do you assess and actively treat both eating disorders and SUDs?
- Who monitors vital signs, laboratory results, medication interactions, withdrawal, and refeeding risk?
- Is an eating-disorder-trained dietitian part of the team?
- Which therapies are offered, and for whom is the program designed?
- How do you handle overdose prevention, suicide risk, and transfers to a hospital?
- Are clinicians licensed, and is the program accredited where applicable?
- What are the total costs, insurance limits, privacy practices, and aftercare plan?
Be cautious of guaranteed cures, “detox” products, weight-loss marketing, before-and-after imagery, or referral sites that do not disclose financial relationships.
Recovery and return-to-use planning
Recovery is rarely linear. A recurrence of a behavior is information that the plan needs adjustment, not proof that treatment failed. A written safety plan can identify early warning signs, meal and hydration support, coping alternatives, people to contact, prescription refills, appointments, and when to step up care.
For opioid risk, discuss naloxone and reduced tolerance after abstinence with a clinician or local harm-reduction service. For alcohol or sedative dependence, ask for a medically supervised withdrawal plan. Schedule follow-up soon after discharge or a return to use, because transitions between levels of care are vulnerable periods.
How to support someone
- Choose a calm, private moment and describe specific changes you have noticed without commenting on weight or appearance.
- Use person-first language: “a person with an eating disorder,” not a label.
- Listen without demanding a confession or debating whether the problem is “serious enough.”
- Offer practical help finding an integrated assessment, arranging transport, or preparing questions.
- Do not police food, dispose of substances without a safety plan, or encourage abrupt withdrawal.
- If there is immediate danger, prioritize emergency help even if the person objects.
If symptoms are affecting health or daily life, our guide to signs it may be time to see a therapist can help start the conversation.
How to get help
Start with a primary-care clinician, eating-disorder specialist, addiction-medicine professional, or licensed mental health clinician. Ask specifically for an assessment of both eating and substance-use symptoms. If services are separate, request written coordination and a shared safety plan.
Seek urgent care for fainting, chest pain, irregular heartbeat, confusion, seizure, severe weakness, uncontrolled vomiting, blood in vomit or stool, inability to keep fluids down, suspected overdose, dangerous withdrawal symptoms, or suicidal intent. If you are unsure, it is safer to contact emergency services or a poison-control center than to wait.
Frequently asked questions
Can substance use cause an eating disorder?
Substances can alter appetite, weight, judgment, and eating behavior, but no single substance explains every eating disorder. Diagnosis requires a broader pattern of symptoms. Shared vulnerabilities and reciprocal reinforcement are often more accurate than a simple one-way cause.
Which eating disorder has the strongest association with SUD?
Research generally finds higher SUD rates in binge-purge presentations than in restricting-only presentations. That does not mean people with restricting presentations are protected; screening is appropriate across eating-disorder diagnoses.
Should the eating disorder or SUD be treated first?
Treat both concurrently when possible, while stabilizing the most immediate medical or safety threat first. For example, dangerous withdrawal or an overdose requires urgent attention, as do severe malnutrition, electrolyte abnormalities, or an unstable heart rhythm.
Can someone have an eating disorder at a higher weight?
Yes. Eating disorders affect people across the weight spectrum. Body size and BMI alone cannot show whether someone is medically stable or whether an eating disorder is present.
Are there medications for co-occurring eating disorders and SUDs?
Some medications are approved or supported for particular eating disorders, and others for particular SUDs, but there is no one medication that treats every co-occurring presentation. Malnutrition, purging, liver or heart effects, and drug interactions may change prescribing decisions, so medication should be managed by a clinician who knows about both conditions.
Is a support group enough?
Peer support can reduce isolation and reinforce recovery, but it is not a substitute for medical assessment, nutrition care, psychotherapy, or medication when those are needed. Choose groups that do not promote dieting, weight stigma, substance use, or competition around symptoms.
What should I look for in a treatment program?
Look for licensed clinicians, the ability to treat both conditions, medical and nutrition monitoring, clear emergency and withdrawal protocols, transparent costs, individualized plans, and structured aftercare. Avoid programs that guarantee results or conceal referral payments.
Key takeaways
Eating disorders and SUDs are distinct but frequently overlapping conditions. Their combination can increase risks involving the heart, electrolytes, nutrition, withdrawal, overdose, and suicide. Evidence supports a coordinated, person-centered plan that addresses both conditions and prioritizes urgent stabilization. Because research on fully integrated protocols is still developing, good care should be individualized and transparent about uncertainty.
Sources
- Substance Abuse and Mental Health Services Administration. Evidence-Based Care for Clients With Co-Occurring Substance Use Disorders and Eating Disorders. Advisory PEP25-02-010, 2026.
- Bahji A, Mazhar MN, Hudson CC, Nadkarni P, MacNeil BA, Hawken E. Prevalence of substance use disorder comorbidity among individuals with eating disorders: A systematic review and meta-analysis. Psychiatry Research. 2019;273:58–66.
- Devoe DJ, Dimitropoulos G, Anderson A, et al. The prevalence of substance use disorders and substance use in anorexia nervosa: a systematic review and meta-analysis. Journal of Eating Disorders. 2021;9:161.
- American Psychiatric Association. The American Psychiatric Association Practice Guideline for the Treatment of Patients With Eating Disorders. 4th ed. 2023.
- National Institute of Mental Health. Eating Disorders: What You Need to Know. Revised 2024.
- National Institute on Drug Abuse. Treatment and Recovery. Current as of June 2025.
- National Institute on Alcohol Abuse and Alcoholism. Thinking About a Change? Accessed August 15, 2026.
