Anorexia Nervosa: Understanding Symptoms, Causes, and Recovery
Anorexia nervosa is a serious eating disorder characterized by restricted food intake, an intense fear of gaining weight, and a distorted body image. It has the highest mortality rate of any mental illness, making early recognition and treatment essential.
Important: This information is for educational purposes only. If you or someone you know may have anorexia, please seek professional help immediately. For crisis support, contact a helpline right away.
Table of Contents
- What Is Anorexia Nervosa?
- DSM-5 Diagnostic Criteria
- Types of Anorexia
- Signs and Symptoms
- Health Consequences
- Causes and Risk Factors
- Treatment Options
- Recovery and Prognosis
What Is Anorexia Nervosa?
Definition
Anorexia nervosa is an eating disorder characterized by:
- Restriction of energy intake leading to significantly low body weight
- Intense fear of gaining weight or becoming fat
- Disturbance in perception of body weight or shape
Key Facts
| Fact |
Data |
| Prevalence |
~0.9% of women, ~0.3% of men |
| Age of onset |
Typically adolescence (ages 14-18) |
| Mortality rate |
Highest of any psychiatric disorder (~5-10%; Arcelus et al., 2011 meta-analysis found ~6-fold elevated mortality vs. the general population) |
| Recovery rate |
~50-70% show substantial improvement or recovery with appropriate treatment over long-term follow-up |
| Treatment duration |
Often years, not weeks |
Who Is Affected?
| Group |
Risk Level |
| Adolescent girls |
Highest risk group |
| Athletes |
Especially aesthetic and weight-class sports |
| Dancers, models |
Appearance-focused professions |
| LGBTQ+ individuals |
Higher prevalence |
| People with perfectionism |
Personality trait association |
| Those with family history |
Genetic component |
DSM-5 Diagnostic Criteria
Criterion A: Restricted Intake
Restriction of energy intake relative to requirements, leading to a significantly low body weight in the context of age, sex, developmental trajectory, and physical health. Significantly low weight is defined as a weight that is less than minimally normal or, for children and adolescents, less than that minimally expected.
Criterion B: Fear of Weight Gain
Intense fear of gaining weight or becoming fat, even though underweight.
Criterion C: Body Image Disturbance
Disturbance in the way in which one's body weight or shape is experienced, undue influence of body weight or shape on self-evaluation, or persistent lack of recognition of the seriousness of the current low body weight.
Severity Specifiers
| Severity |
BMI (Adults) |
| Mild |
BMI ≥ 17 |
| Moderate |
BMI 16-16.99 |
| Severe |
BMI 15-15.99 |
| Extreme |
BMI < 15 |
Types of Anorexia
Restricting Type
| Characteristic |
Description |
| Primary behavior |
Food restriction without binge eating or purging |
| Weight loss method |
Dieting, fasting, excessive exercise |
| Prevalence |
More common presentation |
| Onset |
Often gradual |
Binge-Eating/Purging Type
| Characteristic |
Description |
| Primary behavior |
Regular episodes of binge eating or purging |
| Purging methods |
Self-induced vomiting, laxatives, diuretics |
| Distinction |
Different from bulimia by low body weight |
| Medical risks |
Additional electrolyte and dental complications |
Signs and Symptoms
Behavioral Signs
| Sign |
Description |
| Severe food restriction |
Dramatically limiting food intake |
| Food rituals |
Cutting food into tiny pieces, eating very slowly |
| Avoiding meals |
Skipping meals, making excuses not to eat |
| Excessive exercise |
Compulsive need to burn calories |
| Body checking |
Frequent weighing, mirror checking |
| Wearing loose clothing |
To hide body or stay warm |
| Social withdrawal |
Avoiding situations involving food |
| Cooking for others |
Preparing elaborate meals without eating |
Physical Signs
| Sign |
Description |
| Significant weight loss |
Rapid or extreme weight reduction |
| Thin appearance |
Noticeably underweight |
| Fatigue |
Low energy, weakness |
| Dizziness or fainting |
From malnutrition |
| Cold intolerance |
Feeling cold constantly |
| Hair loss |
Thinning or loss of hair |
| Lanugo |
Fine body hair growth |
| Bluish discoloration |
Of fingers (Raynaud's phenomenon) |
| Absent or irregular periods |
In females |
| Constipation |
Digestive slowing |
Psychological Signs
| Sign |
Description |
| Intense fear of weight gain |
Extreme anxiety about eating |
| Distorted body image |
Seeing self as fat when underweight |
| Denial of seriousness |
Minimizing health risks |
| Preoccupation with food |
Constant thoughts about eating |
| Perfectionism |
High standards, rigid thinking |
| Depression and anxiety |
Common comorbidities |
| Irritability |
From hunger and malnutrition |
| Social isolation |
Withdrawal from relationships |
Health Consequences
Cardiovascular Effects
| Effect |
Description |
| Bradycardia |
Slow heart rate |
| Hypotension |
Low blood pressure |
| Heart failure |
Leading cause of death |
| Arrhythmias |
Irregular heartbeat |
| Cardiac atrophy |
Heart muscle wasting |
Musculoskeletal Effects
| Effect |
Description |
| Osteoporosis |
Bone loss, increased fracture risk |
| Muscle wasting |
Loss of muscle mass |
| Weakness |
Reduced strength |
| Growth retardation |
In adolescents |
Endocrine Effects
| Effect |
Description |
| Amenorrhea |
Loss of menstrual period |
| Infertility |
Difficulty conceiving |
| Thyroid abnormalities |
Hormone imbalances |
| Growth hormone changes |
Affects development |
Gastrointestinal Effects
| Effect |
Description |
| Constipation |
Slowed digestion |
| Bloating |
Abdominal discomfort |
| Gastroparesis |
Delayed stomach emptying |
| Elevated liver enzymes |
Liver stress |
Neurological Effects
| Effect |
Description |
| Difficulty concentrating |
Cognitive impairment |
| Seizures |
In severe cases |
| Peripheral neuropathy |
Nerve damage |
| Brain atrophy |
Loss of brain tissue |
Renal Effects
| Effect |
Description |
| Kidney stones |
Mineral imbalances |
| Kidney failure |
In severe cases |
| Electrolyte imbalances |
Dangerous for heart |
Causes and Risk Factors
Biological Factors
| Factor |
Role |
| Genetics |
Heritability estimated at 50-80% |
| Brain chemistry |
Serotonin, dopamine imbalances |
| Hormones |
Leptin, ghrelin dysregulation |
| Temperament |
Perfectionism, harm avoidance, rigidity |
Psychological Factors
| Factor |
Role |
| Perfectionism |
High standards, fear of failure |
| Low self-esteem |
Negative self-worth |
| Body dissatisfaction |
Distorted body image |
| Need for control |
Eating as controllable aspect |
| Difficulty with emotions |
Using restriction to cope |
| Trauma |
Higher rates of childhood trauma |
Social and Cultural Factors
| Factor |
Role |
| Media influence |
Unrealistic thin ideal |
| Diet culture |
Normalization of restriction |
| Peer pressure |
Social comparison |
| Family dynamics |
High achievement expectations |
| Cultural values |
Emphasis on appearance |
| Weight stigma |
Anti-fat bias |
Risk Factors Summary
| Category |
Risk Factors |
| Individual |
Female gender, adolescence, perfectionism, anxiety |
| Family |
Family history of eating disorders, high expectations |
| Social |
Appearance-focused activities, bullying, weight teasing |
| Life events |
Dieting, trauma, major transitions |
Treatment Options
Levels of Care
| Level |
Description |
Criteria |
| Outpatient |
Weekly therapy, medical monitoring |
Mild cases, medically stable |
| Intensive Outpatient (IOP) |
Multiple sessions/week |
Moderate symptoms |
| Partial Hospitalization (PHP) |
Full-day programming |
Moderate-severe, needs structure |
| Residential |
24/7 care facility |
Severe, needs constant support |
| Inpatient |
Hospital-based |
Medically unstable, crisis |
Medical Stabilization
| Intervention |
Purpose |
| Weight restoration |
Gradual, supervised weight gain |
| Electrolyte correction |
Prevent cardiac complications |
| Cardiac monitoring |
Watch for arrhythmias |
| Nutritional rehabilitation |
Structured meal plans |
| Vital sign monitoring |
Track physical stability |
Nutritional Treatment
| Component |
Description |
| Registered dietitian |
Specialized in eating disorders |
| Meal planning |
Structured eating schedule |
| Weight restoration goals |
1-2 lbs per week |
| Caloric increases |
Gradual advancement |
| Supplements |
If needed for deficiencies |
Psychotherapy
Family-Based Treatment (FBT)
| Phase |
Focus |
| Phase 1 |
Parents take control of eating |
| Phase 2 |
Gradual return of eating control to adolescent |
| Phase 3 |
Address adolescent development issues |
Medications
| Medication |
Use |
| SSRIs |
For comorbid depression/anxiety (after weight restoration) |
| Olanzapine |
May help with weight gain and anxiety (off-label) |
| No FDA-approved medications |
Specifically for anorexia |
Recovery and Prognosis
Recovery Rates
| Outcome |
Percentage |
| Full recovery |
~50-70% with treatment |
| Partial recovery |
~20-30% |
| Chronic course |
~10-20% |
| Mortality |
~5-10% (highest of any psychiatric disorder) |
Estimates based on long-term outcome studies and the Arcelus et al. (2011) meta-analysis (Archives of General Psychiatry); figures vary by sample and follow-up length.
Factors Predicting Better Outcome
| Factor |
Description |
| Early intervention |
Shorter illness duration before treatment |
| Younger age |
Adolescent onset |
| Family support |
Engaged, supportive family |
| No binge/purge behaviors |
Restricting type |
| Lower severity |
Less medical complications |
Recovery Signs
| Sign |
Description |
| Weight restoration |
Reaching healthy weight range |
| Normalized eating |
Regular meals, variety of foods |
| Reduced fear |
Less anxiety about food and weight |
| Body acceptance |
Improved body image |
| Emotional regulation |
Healthier coping mechanisms |
| Social reconnection |
Engaging with others |
| Identity beyond ED |
Interests outside eating disorder |
Relapse Prevention
| Strategy |
Description |
| Continued therapy |
Ongoing support after weight restoration |
| Regular meals |
Maintaining structured eating |
| Support network |
Family, friends, support groups |
| Identify triggers |
Recognize warning signs |
| Self-compassion |
Be patient with recovery process |
| Professional support |
Know when to seek help |
Key Takeaways
- Anorexia is serious - Highest mortality rate of any psychiatric disorder
- Early intervention matters - Better outcomes with earlier treatment
- It's not about vanity - Complex biological, psychological, and social factors
- Treatment works - Full recovery is possible with appropriate care
- Family involvement helps - Especially for adolescents
- Medical monitoring is essential - Life-threatening complications can occur
- Recovery takes time - Often years, not weeks
Related Resources
Self-Assessment
Related Conditions
Crisis Resources
- ANAD Eating Disorders Helpline: 1-888-375-7767 (US; the former NEDA helpline ceased operating in 2023)
- Crisis support (US): Call or text 988, or text "HOME" to 741741
- Beat Eating Disorders (UK): 0808 801 0677
This content is for educational purposes only and does not replace professional medical advice. If you or someone you know is struggling with an eating disorder, please seek professional help immediately.