Eating disorders and addiction can arrive in treatment with one diagnosis clearly identified and the other barely mentioned. A person in active addiction may also have dangerously disordered eating. Someone in recovery from alcohol use may find that binge eating escalates as drinking stops.
Estimates suggest up to half of people with eating disorders also have substance use disorders, and the relationship runs both ways. Both deserve clinical attention. Treating one without acknowledging the other usually fails.
A quick map of eating disorders
The following diagnoses can occur alongside substance use.
Anorexia nervosa
Characterised by restriction of food intake leading to significantly low body weight, intense fear of weight gain, and a disturbed perception of body weight or shape. Anorexia has the highest mortality rate of any psychiatric condition, including from medical complications and from suicide.
Anorexia exists in two main forms: restricting type (food restriction alone) and binge-eating/purging type (restriction with episodes of binge eating and compensatory behaviours such as vomiting or laxative use).
Bulimia nervosa
Recurrent episodes of binge eating followed by compensatory behaviours (vomiting, laxatives, excessive exercise, fasting) to prevent weight gain. Bulimia involves a felt loss of control during binges and a self-evaluation strongly tied to body shape and weight.
Binge eating disorder
Recurrent episodes of binge eating, with a sense of loss of control, but without the regular compensatory behaviours that define bulimia. Often associated with significant distress, shame, and medical complications.
Other specified and unspecified feeding or eating disorders (OSFED, UFED)
Categories for clinically significant disordered eating that does not meet the full criteria for the above. Far from being “mild” forms, these often involve serious clinical issues and warrant treatment.
ARFID and other less-recognised patterns
Avoidant/Restrictive Food Intake Disorder (ARFID), orthorexia (rigid focus on “clean” or “healthy” eating to the point of harm), and other patterns may co-occur with substance use, though research is still developing.
Why eating disorders and addiction often co-occur
Shared neurobiology
The brain systems that regulate reward, satiety, impulse control, and emotion regulation overlap significantly between eating disorders and addiction. The neurobiology is not identical, but it is closely related.
Shared psychological drivers
Both conditions often function as ways of managing emotion. Restriction or bingeing, like substance use, can numb, distract, or provide a sense of control in the face of overwhelming feeling. The function is similar; the mechanism differs.
Substitution and crossover
Some clinical patterns:
- A person in early recovery from substance use develops or intensifies disordered eating. The compulsion shifts to food.
- A person with an eating disorder discovers that stimulants suppress appetite and use them to support restriction.
- A person with bulimia uses alcohol or other substances during binge episodes, blurring the boundary between substance binge and food binge.
- A person uses cannabis to manage anxiety around eating, which over time creates its own dependence.
Shared risk factors
Trauma history, perfectionism, family environment, genetic vulnerability, anxiety and depression, all contribute to risk for both conditions.
Body and identity issues
Both conditions often involve a disturbed relationship to the body, self-worth bound up with appearance or with the substance, and an identity organised around the disorder.
The specific dangers of the combination
The medical and psychological risks of either condition are real. Combined, they compound.
Medical complications
- Cardiac: Severe restriction can cause cardiac muscle wasting and arrhythmias. Stimulant use compounds cardiovascular stress. The combination can be lethal.
- Electrolyte disturbances: Vomiting, laxative use, and alcohol use all disturb electrolyte balance. Severe imbalances can cause cardiac arrest.
- Refeeding syndrome: When someone severely underweight begins to eat again, dramatic electrolyte shifts can occur. Requires medical management.
- Bone density: Severe restriction over time causes osteoporosis. Alcohol use compounds bone loss.
- Gastrointestinal: Both conditions damage the gut. The combination accelerates this.
- Liver and metabolic: Alcohol on a malnourished system is particularly damaging.
Psychiatric risk
- Suicide risk is elevated in both conditions. In combination, the risk is significantly higher.
- Depression, anxiety, and trauma symptoms are common with both.
- Self-harm may be present alongside.
Clinical complexity
Detoxification from substances in someone with an active eating disorder is more complex. Refeeding considerations, electrolyte management, and psychiatric stability all need careful coordination.
Why this combination often goes untreated
Several reasons the combination is under-recognised.
Treatment settings are often siloed
Eating disorder services often focus on the eating disorder and may not have addiction expertise. Addiction services often focus on substance use and may not assess for eating disorders, or may not be set up to treat them safely.
Stigma and shame
Both conditions carry significant shame. People are often more willing to disclose one than the other, even to themselves. The substance use may be reported while the eating behaviour is hidden, or vice versa.
Cultural normalisation
Disordered eating is normalised in many cultures and social groups to the point that it does not appear as a clinical problem. The person may not even consider it part of their picture.
Visible substance use, invisible eating behaviour
Substance use eventually becomes visible to those around the person. Eating behaviours, particularly restriction or purging, can remain hidden for years.
Practitioner discomfort
Some practitioners feel less confident with eating disorders than with addiction, and may avoid asking the questions that would surface them.
How Anker Huis approaches the combination
We treat eating disorders alongside substance use within our integrated dual diagnosis programme. The principles:
Comprehensive assessment
The intake assessment actively screens for eating disorders. This includes:
- Direct questions about restrictive, binge, and compensatory behaviours.
- Body image questions.
- Weight history and fluctuations.
- Family history of eating disorders.
- Specific medical history relevant to disordered eating.
We acknowledge that disclosure can be hard. The assessment is built to support honest conversation.
Medical coordination
Where the eating disorder has medical implications, our clinical team coordinates carefully. This may include:
- Pre-admission medical assessment.
- Electrolyte monitoring during early treatment.
- Careful management of refeeding if severe restriction has been part of the picture.
- Liaison with specialist eating disorder services where the clinical picture requires it.
Therapy that addresses both
The therapy work addresses the shared underlying drivers (emotion regulation, distress tolerance, identity, body relationship) alongside the specific manifestations of each condition.
- CBT for eating disorders (CBT-E) approaches.
- DBT-informed skills work for emotional regulation.
- Trauma-focused work where indicated.
- Family work where appropriate.
Nutritional and embodied work
A clinical dietician’s input is essential where eating behaviours are significantly disordered. We engage appropriate specialist input.
Acknowledgement of limits
Some severe eating disorder presentations require specialist eating disorder inpatient treatment as the primary modality, with substance use treated alongside. We will say so clearly where this is the appropriate path, and refer accordingly. The wrong placement does no one any favours.
A note for families
If you suspect that the eating behaviour of a loved one in addiction is also disordered, your observation is worth bringing to a clinical conversation.
- Do not try to address the eating behaviour through pressure or argument. This rarely helps and often escalates the secrecy.
- Note specific observations: meals avoided, repeated trips to the bathroom after eating, unusual rituals around food, weight fluctuations, comments suggesting distorted body perception.
- Bring these observations to the admissions clinician.
- Be aware of your own relationship to food and body, since family environments shape these from early.
What recovery from the combination looks like
Recovery needs attention to medical safety and ongoing work on both conditions.
- The early phase is medically careful. The combined picture requires more attention to physical safety than either condition alone.
- Both conditions usually need ongoing work. Neither is fully “fixed” in a residential phase. Both can move significantly forward.
- Cross-substitution is a real risk. As one behaviour reduces, the other can intensify. Treatment plans anticipate this.
- Identity work is substantial. Both conditions often anchor identity. Recovery involves the slow building of a self organised around something other than the disorder.
FAQ: eating disorders and addiction
Is binge eating disorder really comparable to substance addiction? Clinically yes in many respects. The compulsive use of food despite consequences, the loss of control, and the underlying drivers overlap significantly with substance use disorders.
Can someone be in recovery from alcohol while still in an active eating disorder? Treatment usually addresses both. Continuing one disorder while the other is in recovery is rarely stable.
Are eating disorders only a women’s issue? No. Men, including young men, increasingly present with eating disorders. The combination of eating disorder and substance use is significant in both genders.
Will Anker Huis treat someone with severe anorexia? Severe anorexia (very low BMI, medical instability) usually requires specialist eating disorder inpatient treatment as the primary modality. We work with the picture where the eating disorder is significant but not at the level requiring specialised refeeding settings. Our admissions team will advise on the right pathway.
Is bulimia treatable? Yes. The evidence for CBT-E and related approaches is strong. Recovery from bulimia is a realistic goal.
How do I help a family member who I think has both? Bring your observations to a clinician. Avoid confrontation about the eating behaviour. Get your own support; loving someone with this combination is exhausting.
If eating disorder and substance use are entangled in your situation, Anker Huis provides integrated assessment and treatment in Cape Town. Call +27 72 088 0446 or email info@ankerhuis.co.za.
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