Eating Disorders: Types, Warning Signs, and Treatment

Introduction

Eating disorders are serious mental health conditions involving persistent disturbances in eating behaviour, body image, and relationship with food. They can affect anyone, cause significant physical and psychological harm, and carry some of the highest mortality rates of any mental health condition. Recovery is possible, and outcomes are better when eating disorders are identified and treated early.

Key Points

Eating disorders are mental health conditions — not choices, phases, or vanity.
They include anorexia nervosa, bulimia nervosa, binge eating disorder, ARFID, and others.
Eating disorders can cause serious medical complications affecting the heart, bones, teeth, hormones, and gut.
Treatment is multidisciplinary: GP, psychologist, and dietitian working together.
Early recognition and access to care significantly improve outcomes.
Recovery is possible — for many people, full recovery is achievable.

Types of Eating Disorders

Anorexia Nervosa

Anorexia nervosa involves restriction of food intake leading to significantly low body weight, combined with an intense fear of gaining weight and a distorted perception of body shape. Anorexia has the highest mortality rate of any mental health condition — from both medical complications and suicide. People of any body size can be affected; the focus is on the psychological and behavioural pattern, not any specific weight.

Bulimia Nervosa

Bulimia nervosa involves recurrent cycles of eating large amounts of food in a short time (bingeing) followed by behaviours intended to prevent weight gain — such as vomiting, laxative use, fasting, or excessive exercise. Shame and secrecy are often central features. Bulimia can occur at a range of body sizes and may be less visible than anorexia.

Binge Eating Disorder (BED)

Binge eating disorder involves recurrent episodes of eating large amounts of food, accompanied by a sense of loss of control and significant distress. Unlike bulimia, these episodes are not followed by compensatory behaviours. BED is the most common eating disorder diagnosis and is associated with significant emotional burden.

Avoidant/Restrictive Food Intake Disorder (ARFID)

ARFID involves severely limited food intake due to sensory sensitivities, fear of aversive consequences (choking, vomiting, illness), or low interest in eating — rather than concerns about weight or body image. It can cause nutritional deficiency, impaired growth in children, and significant disruption to social and daily life. It is more common in children and in people with autism or anxiety disorders, but occurs in adults too.

Other specified and unspecified feeding or eating disorders (OSFED/UFED)

Many people do not fit neatly into the categories above but still experience clinically significant eating disorder symptoms that warrant assessment and treatment.

Warning Signs

Eating disorders often develop gradually and may be concealed. Warning signs to look out for — in yourself or someone you care about — include:

Behavioural:

Significant changes in eating habits — eating very little, avoiding food groups, or rigid food rules
Disappearing after meals
Eating alone or avoiding social eating situations
Preoccupation with recipes, food, nutrition, or cooking without eating much
Excessive or compulsive exercise, especially if distressed when unable to exercise

Psychological:

Intense preoccupation with food, weight, or body shape
Distorted view of one’s own body
Strong emotional reactions to food, eating, or weight-related topics
Mood changes, irritability, anxiety, or low self-esteem around food and body
Rigid all-or-nothing thinking about food (“clean” vs “bad” foods)

Social:

Withdrawal from friends, family, and social occasions
Secrecy around food or eating
Declining social invitations that involve food

Physical:

Feeling cold frequently
Dizziness, faintness, or fatigue
Hair thinning or loss
Dental damage or mouth sores
Digestive discomfort, bloating, or constipation
Menstrual irregularity or loss of periods

Medical Risks

Eating disorders can cause serious and potentially life-threatening medical complications, including:

Heart: irregular heart rhythm (arrhythmia), low heart rate, low blood pressure
Electrolytes: dangerous imbalances in potassium, sodium, and other minerals — particularly with purging behaviours
Bones: low bone density and increased fracture risk, especially with long-standing restriction
Reproductive health: disruption to the menstrual cycle, hormonal changes, fertility difficulties
Dental: erosion of tooth enamel, dental decay
Digestive system: delayed gastric emptying, acid reflux, constipation
Brain and cognition: difficulty concentrating, low mood, impaired memory

Medical complications require medical monitoring alongside psychological treatment. Many complications are reversible with sustained recovery — but some, particularly bone density changes, may have lasting effects.

Diagnosis and Assessment

Eating disorders are assessed by a clinician — usually a GP as the first point of contact — using a combination of clinical history, validated screening tools (such as the SCOFF questionnaire or EDE-Q), and physical assessment.

A GP assessment will typically include:

Careful history of eating patterns, thoughts, and behaviours
Physical examination
Blood tests to assess electrolytes, blood count, thyroid function, and bone health indicators
ECG in some presentations

A GP can then coordinate referral to specialist eating disorder services, psychologists, and dietitians as appropriate.

Treatment and Management

Eating disorder treatment is most effective when it is multidisciplinary, collaborative, and sustained. The person’s voice and values should be central to care.

GP and medical care

Regular monitoring of physical health and medical risk
Blood tests, ECG, bone density monitoring as clinically indicated
Coordination of care between professionals

Psychological therapies

Family-Based Treatment (FBT): the first-line approach for adolescents and young people with anorexia; involves the family as a central support in recovery.
CBT-Enhanced (CBT-E): a highly effective, disorder-specific form of CBT for adults with bulimia, binge eating disorder, and some presentations of anorexia.
Dialectical Behaviour Therapy (DBT): particularly useful where emotion dysregulation, self-harm, or impulsivity are prominent features.
Maudsley Anorexia Nervosa Treatment for Adults (MANTRA): a structured therapy specifically designed for adults with anorexia.

Dietetic support

A dietitian with eating disorder experience provides nutritional rehabilitation and helps the person develop a healthier relationship with food — without prescribing specific diets or imposing rules. Nutritional care is a vital part of recovery and is distinct from the psychological work.

Medication

Medication does not treat eating disorders directly but can help with co-occurring depression, anxiety, or OCD. Antidepressants — particularly SSRIs — are sometimes used in bulimia nervosa and binge eating disorder alongside therapy.

Higher levels of care

When medical risk is high or outpatient treatment has not been sufficient, more intensive support is available:

Day programmes: structured support during the day while the person continues to live at home
Inpatient care: admission to a specialist unit for medical stabilisation and intensive treatment

When to Seek Urgent Help

Seek emergency medical care if you or someone you know is experiencing:

Fainting, collapse, or very low blood pressure
Chest pain or palpitations
Muscle weakness or seizures
Severe confusion or disorientation
Significant dehydration
Thoughts of suicide or self-harm

Crisis support:

Australia: Butterfly Foundation — 1800 33 4673 | Lifeline — 13 11 14
United Kingdom: Beat Eating Disorders — 0808 801 0677 | Samaritans — 116 123
United States: NEDA Helpline — 1-800-931-2237 | Crisis line — call or text 988

For medical emergencies: 000 (Australia) | 999 (UK) | 911 (US/Canada).

FAQ

Q: Who can develop an eating disorder? A: Anyone — regardless of gender, age, background, or body shape. Eating disorders are significantly under-recognised in men, older adults, and people in larger bodies.

Q: Is an eating disorder a choice? A: No. Eating disorders are serious mental health conditions requiring professional support. Recovery is not simply a matter of deciding to eat differently.

Q: What are the warning signs? A: Changes in eating patterns, preoccupation with food or body shape, withdrawal from social eating, significant mood changes, and physical symptoms such as dizziness, fatigue, or dental damage.

Q: What does treatment involve? A: A team approach — GP for medical care, psychologist for therapy (CBT-E, FBT, DBT), and a dietitian for nutritional support. More intensive care is available when needed.

Q: Can eating disorders affect physical health? A: Yes, significantly — including heart rhythm disturbances, electrolyte imbalances, bone loss, and hormonal disruption. Medical monitoring is an essential part of care.