Clinically, the answer is clear: eating disorders are classified as mental illnesses, and they also carry serious physical health risks that can affect almost every system in the body. Yet this dual nature is still widely misunderstood, and that confusion can delay people from getting help.
Dr Jaya Verma shares her clinical insight into how eating disorders are classified, why they are considered one of the most dangerous mental illnesses, and what effective eating disorder treatment actually involves.
How eating disorders are classified as mental illness
In the UK, eating disorders are classified as mental health conditions under the World Health Organisation’s International Classification of Diseases, Eleventh Revision (ICD-11), the framework used by the NHS and UK clinicians for diagnosis.
This classification reflects the fact that eating disorders are rooted in psychological distress, not simply in food or appearance. The main recognised types include anorexia nervosa, bulimia nervosa, binge eating disorder, ARFID, and OSFED.
Why are eating disorders classified as mental illness?
Psychological and emotional distress
Anxiety, depression, and obsessive thinking patterns are common alongside eating disorders, with food often used as a way of coping with distress that runs much deeper.
Cognitive distortions
Body dysmorphia can cause someone to perceive themselves very differently from how they actually appear, regardless of their body size or weight. This distortion in self-perception is a psychological symptom in its own right.
Compulsive and obsessive behaviours
Ritualised eating habits, excessive exercise, and constant calorie counting share similarities with obsessive-compulsive patterns, pointing to a neurological and psychological basis rather than a lifestyle choice.
Genetic and biological factors
There is a widely recognised genetic factor in eating disorder development, often alongside a family history of depression or anxiety, with imbalances in neurotransmitters such as serotonin and dopamine affecting mood and appetite regulation.
Impact on daily functioning
As with other mental health conditions, eating disorders can significantly affect relationships, work, and everyday life, often through a persistent, intrusive focus on food, weight, or control.
Are eating disorders a mental or physical illness?
The psychological experience
An eating disorder often begins as a way of managing difficult emotions, low self-esteem, or a need for control and can become an all-consuming psychological experience shaping how someone thinks and feels each day.
The physical toll on the body
Alongside this, eating disorders can cause serious physical harm, including heart and digestive complications, hormonal disruption, bone density loss, and malnutrition. In severe cases, these physical effects can become life-threatening.
Because eating disorders affect the mind and body together, effective treatment has to do the same, addressing psychological and physical health side by side rather than treating one without the other.
Eating disorders rarely occur in isolation
Eating disorders are frequently linked with other mental health conditions, including:
- Depression: Feelings of low mood or worthlessness that can contribute to restrictive eating
- Anxiety disorders: Fear around weight or food that can present as social anxiety or perfectionism
- Post-traumatic stress disorder: Past trauma that can manifest through disordered eating patterns
- Substance use: Using drugs or alcohol alongside disordered eating to manage stress or suppress appetite
This is one of the reasons ABBI Clinic treats eating disorders holistically, rather than in isolation from someone’s wider mental health.
Myths and misconceptions about eating disorders
- “Eating disorders are just about food”: In reality, they’re rooted in control and deeper psychological distress.
- “Only women experience eating disorders”: Men and non-binary people experience them too, often without being recognised.
- “People choose to have an eating disorder”: Eating disorders are serious illnesses, not lifestyle choices or a matter of willpower.
- “You can tell by looking at someone”: Eating disorders affect people of any body size or weight, and many people never look visibly unwell.
How ABBI Clinic treats the whole person
Because eating disorders sit at the intersection of mental and physical health, ABBI Clinic offers full-pathway, multidisciplinary treatment plans bringing together psychiatry, specialist GP input, dietetics, and individual, group, and family therapy under one roof.
Treatment is available in person, online, or as a hybrid of the two and can be shaped around whatever stage of illness someone is at. Early intervention tends to lead to better outcomes, so support is just as valuable in the earlier stages as it is for more severe presentations.
FAQs: Eating disorders as mental illness
Are eating disorders a serious mental illness?
Yes. In the UK, eating disorders are classified as mental health conditions under the ICD-11, the diagnostic framework used by the NHS. They are rooted in psychological distress, even though they often present through physical symptoms.
Are eating disorders the deadliest mental illness?
Eating disorders, particularly anorexia nervosa, are associated with one of the highest mortality rates of any mental illness, largely due to the serious physical complications they can cause. This is one of the key reasons early intervention and specialist treatment are so important.
Access Eating Disorder Treatment at ABBI Clinic
If you’re concerned about yourself or someone you care about, reaching out sooner rather than later can make a real difference. Get in touch with the ABBI Clinic team by phone or email, and we’ll talk you through the next steps for your situation.
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