Nearly two out of three U.S. adults struggle with issues related to being overweight.
A smaller but notable portion of the population suffers from eating disorders, often resulting in normal weight or underweight conditions due to a fear of gaining weight.
Disorders like bulimia nervosa and anorexia nervosa lead to severe health consequences (Mayo Clinic, 2012a, 2012b).
Definition of Anorexia Nervosa (AN)
Anorexia nervosa is characterized by a body weight significantly below the average caused by extreme starvation and/or excessive exercise.
Individuals with AN often exhibit distorted body image, perceiving themselves as overweight despite being underweight.
Signs and Symptoms of Anorexia Nervosa
General Symptoms
Patients may:
Perceive themselves as overweight even when underweight.
Weigh themselves obsessively.
Severely restrict their food intake.
Engage in excessive exercise.
Induce vomiting or misuse laxatives to control weight.
Specific Signs
Extremely restricted eating
Extreme thinness (emaciation)
Relentless pursuit of thinness and refusal to maintain a healthy weight
Intense fear of gaining weight
Distorted body image, heavily influencing self-esteem
Denial regarding the severity of low body weight
Mortality Rate
Anorexia nervosa has the highest mortality rate of any mental disorder, with deaths resulting from starvation complications and suicide.
DSM-5 Criteria for Anorexia Nervosa
Anorexia is sub-categorized into:
Restrictive subtype
Binge-eating/purging subtype
Diagnosis is confirmed when:
Body weight is less than 85% of the normal BMI.
Accompanied by a profound fear of weight gain and distorted body image.
Additional Symptoms Over Time
Mild anemia and muscle wasting
Brittle hair and nails
Dry and yellowish skin
Growth of lanugo (fine hair on body)
Severe constipation
Low blood pressure, slowed heart rate and breathing
Damage to heart structure and function
Difficulty in concentration
Potential brain damage
Multiorgan failure
Drop in internal body temperature leading to constant cold sensation
Lethargy or chronic tiredness
Amenorrhea (loss of menstrual periods)
Infertility
Epidemiology of Anorexia Nervosa
Statistics
Anorexia affects approximately:
0.3% to 2% of young women
0.1% to 0.3% of young men
Females aged 15 to 24 are at a ten times higher risk of dying from this disorder compared to their peers.
Males with anorexia face a heightened risk of late diagnosis due to sociocultural factors.
Etiology of Anorexia Nervosa
Genetic Factors
Anorexia has a heritability rate between 28% to 58% and often exceeds 50% in higher estimates.
First-degree relatives of those with anorexia have approximately 12-fold increased risk of developing the disorder.
Studies suggest associations with 43 genes related to eating behaviors and psychological traits.
Epigenetic modifications like DNA methylation may also contribute to the disorder's development.
Environmental Factors
Obstetric, prenatal, and perinatal complications (e.g., preterm birth, maternal diabetes) may impact the risk for anorexia.
Neuroendocrine dysregulation affecting hunger and satiety signals may play a role.
Presence of gastrointestinal disorders increases vulnerability to eating disturbances, particularly restrictive eating practices.
Some complications can create food aversions or anxiety leading to disordered eating.
Psychological Factors
Early theories linked anorexia to childhood trauma but evidence is inconsistent; low self-esteem, feelings of control loss, depression, and anxiety are also significant contributors.
Sociological Factors
Vulnerability to societal body ideals, especially since the 1950s, has increased incidence of anorexia, particularly among those in body-sensitive professions (e.g., modeling, athletics).
Family dynamics, cultural pressures, and bullying can exacerbate psychological symptoms.
Media Influence
Constant exposure to media promoting unrealistic body ideals can increase body dissatisfaction and contribute to anorexia.
Men's magazines show greater focus on body shape, whereas women's media often presents weight loss as more appealing.
Pro-anorexia websites promote harmful ideals and distort reality by showcasing manipulated images.
Treatment Approaches
Multidisciplinary Treatment Plan
Patients benefit from a combination of nutritional support, psychological counseling, and behavioral modification.
Treatment aggressiveness is tailored to the patient's health stability, with high-risk patients often needing inpatient care.
The Maudsley Method
A family-oriented treatment strategy involving:
Weight restoration through parental assistance.
Familial dynamics adjustment to aid recovery.
Promoting independence and healthy identity post-weight gain.
Nutritional Therapy
Focuses on promoting weight gain, generally estimated at 2-3 pounds per week in inpatient care, and 1 pound per week in outpatient settings.
It is crucial to approach patients with empathy rather than a punitive manner.
Medication Options
Limited evidence supports the use of antidepressants or antipsychotics in promoting weight gain or reducing distress.
Psychotherapy for Recovery
Once weight stabilization is achieved, the focus shifts to recognizing distorted food perceptions and handling emotions to prevent relapse.
Approximately 50% of patients relapse within a year of being discharged from treatment programs.