Anorexia Nervosa: Understand the Signs, Risks and Treatment

What Is Anorexia Nervosa?

Anorexia nervosa is diagnosed using a combination of psychological, behavioural, and physical features.

The core features include the following:

• Restriction of energy intake leading to significantly low body weight relative to the person’s age, gender, developmental trajectory, and physical health.
• An intense fear of gaining weight or persistent behaviour that interferes with weight gain.
• Disturbance in the way body weight or shape is experienced, excessive influence of body weight or shape on self-evaluation, or difficulty recognising the seriousness of the current low body weight.

Importantly, body weight alone does not determine whether someone has a serious eating disorder. People can experience significant medical complications from restrictive eating even when they do not appear extremely underweight. Atypical anorexia nervosa, classified under other specified feeding or eating disorders, can involve many of the physical complications associated with anorexia nervosa [2].

Is Anorexia Nervosa Only Seen in Teenage Girls?

No. Anorexia nervosa commonly begins during adolescence or early adulthood, but it can occur in children, adults, and older people. It can also affect males and people of different body sizes and backgrounds. Therefore, eating-disorder symptoms should not be dismissed because of a person’s following factors:

• Age
• Gender
• Current body weight
• Previous body size
• Cultural background

Signs and Symptoms of Eating Disorders: Recognising Anorexia Nervosa

Recognising the signs and symptoms of eating disorders early significantly improves treatment outcomes and recovery potential. Anorexia nervosa manifests through physical, behavioural, and psychological changes that develop gradually.

Here are the five most common symptoms and signs that you must know:

1. Changes in Eating Behaviour

Possible warning signs include the following:

• Restricting portion sizes or skipping meals
• Avoiding particular food groups
• Increasing concern about calories or food ingredients
• Eating according to increasingly rigid rules
• Avoiding meals with family or friends
• Repeatedly checking food labels or body weight
• Showing distress around eating

These behaviours do not automatically mean that someone has anorexia nervosa, but persistent or escalating restriction deserves attention.

2. Excessive Exercise or Compensatory Behaviour

Some people with anorexia nervosa may exercise excessively or feel compelled to exercise despite illness, fatigue, injury, or medical advice to rest. Self-induced vomiting, misuse of laxatives or diuretics, repeated weighing, and other attempts to compensate for eating. The presence and type of these behaviours can help clinicians understand the eating disorder and its medical risks.

3. Physical Warning Signs

Restriction and malnutrition can affect multiple body systems.

Possible physical changes include the following:

• Significant or rapid weight loss
• Fatigue and weakness
• Feeling unusually cold
• Dizziness or fainting
• Low blood pressure
• Slow heart rate
• Abnormal heart rhythms
• Dehydration
• Gastrointestinal symptoms
• Hair thinning or hair loss
• Fine body hair growth
• Menstrual changes
• Reduced bone density

Children and adolescents may also experience slowed growth or delayed puberty. Not everyone develops all of these symptoms.

4. Psychological and Behavioural Changes

Possible psychological features include:

• Strong fear of weight gain
• Persistent concern about body shape or weight
• Distress associated with eating
• Increasing preoccupation with food, calories, exercise, or body image
• Anxiety or low mood
• Social withdrawal
• Difficulty concentrating
• Irritability
• Reduced interest in activities outside food, weight, or exercise

Some people may also feel ambivalent about treatment or may find it difficult to recognise how seriously the illness is affecting them. This does not mean that every person with anorexia is “in denial”. A supportive, non-judgemental approach is generally more appropriate than confrontation.

5. Medical Complications of Anorexia Nervosa

Prolonged restriction and malnutrition can affect the heart, bones, hormones, gastrointestinal system, kidneys, liver, and other organs.

Potential complications include the following:

Severe electrolyte abnormalities, dehydration, malnutrition, or signs of organ failure can require urgent medical care.

What Causes Anorexia Nervosa?

There is no single cause. Current research supports a multifactorial model involving biological, genetic, psychological, metabolic, and environmental factors.

Genetic Factors

Genetic research has identified a substantial inherited component. A large genome-wide association study involving 16,992 people with anorexia nervosa and 55,525 controls identified eight significant genetic loci. Earlier twin studies estimated heritability at approximately 50-60% [3].

This does not mean that a person with a family history will necessarily develop anorexia nervosa.

Psychological Factors

Certain traits may be associated with greater vulnerability, including the following:

• Perfectionistic tendencies
• Rigidity
• Anxiety
• Obsessive or compulsive traits
• Difficulties with self-esteem
• Strong concerns about body image

These characteristics are risk factors, not direct causes.

Environmental and Sociocultural Factors

Body-image concerns can be influenced by peer pressure, weight-related teasing or bullying and social media. Appearance-focused environments, sports or activities that emphasise body size or weight, and family or social attitudes toward food and body shape can also play a big role. These factors may interact with biological and psychological vulnerabilities rather than acting as a single cause.

Also read: Obesity in Women – Alert for Modern Girls!

Anorexia Nervosa Treatment: Evidence-Based Approaches in India

Anorexia nervosa treatment requires multidisciplinary intervention combining medical stabilisation, nutritional rehabilitation, psychotherapy, and family involvement for optimal outcomes.

Here are some of the treatments for anorexia nervosa:

• Medical stabilisation addresses life-threatening complications, including cardiac abnormalities, electrolyte imbalances, and severe malnutrition requiring hospitalisation. Close monitoring prevents refeeding syndrome, a potentially fatal complication when nutrition resumes after prolonged starvation.
• Nutritional rehabilitation, guided by registered dietitians, establishes individualised meal plans to target weight restoration and the normalisation of eating patterns. Micronutrient supplementation, including thiamine, prevents deficiencies during early refeeding. Weight gain during the first treatment month predicts better long-term recovery outcomes significantly.
• Psychotherapy forms the core of treatment, with enhanced cognitive behavioural therapy, family-based treatment for adolescents, and specialist supportive clinical management demonstrating effectiveness. Family-based treatment demonstrates the strongest evidence for adolescents, directly involving families in meal supervision and weight restoration.
• Psychiatric medication treats co-occurring conditions like depression, anxiety, and obsessive-compulsive disorder rather than anorexia itself directly. Antidepressants address comorbid mental health conditions once nutritional status improves sufficiently for medication efficacy.
• GLP-1 drugs used for obesity and diabetes management are contraindicated in patients with anorexia nervosa due to the risk of appetite suppression. These medications trigger relapse in recovered individuals and reinforce restrictive eating patterns dangerously. Misdiagnosis of a typical anorexia as obesity can lead to harmful, inappropriate prescribing.

5 Critical Steps for Early Intervention

The following section provides a step-wise analysis for early intervention of anorexia nervosa.

Step 1: Recognise Early Warning Signs

Professional evaluation is warranted when disordered eating behaviours emerge, regardless of body weight. Initial indicators include restrictive eating patterns, obsessive food preoccupation, excessive exercise, and social withdrawal. Delay in assessment correlates with a poorer prognosis and a longer duration of illness.

Step 2: Approach with Compassion, Not Confrontation

Avoid weight-focused or appearance-based comments, which reinforce pathological preoccupations. Use non-judgmental language expressing specific behavioural concerns observed. Address resistance calmly; denial is a core feature of the illness, not willful non-compliance that requires repeated gentle attempts.

Step 3: Seek Immediate Professional Evaluation

Initiate psychiatric or eating disorder specialist assessment within 48-72 hours of identifying concerning symptoms. The duration of untreated illness directly affects recovery trajectories and treatment outcomes. Outpatient evaluation should proceed regardless of insurance authorisation delays or BMI thresholds.

Step 4: Involve Family from Treatment Start

Family-based therapy demonstrates superior efficacy for adolescent populations compared to individual approaches. Parental participation in meal supervision, weight restoration protocols, and addressing maladaptive family dynamics constitutes evidence-based first-line intervention. Systemic involvement reduces dropout rates and treatment resistance.

Step 5: Document and Monitor Systematically

Systematic documentation of eating patterns, weight fluctuations, physical symptoms, and behavioural changes facilitates accurate clinical assessment. Regular monitoring of vital signs, electrolyte panels, and cardiac function helps detect medical complications that require immediate intervention. Objective records appropriately guide treatment intensification decisions.