Fundamentals of Psychology: Eating Disorders

Psychopathology of Eating Disorders

Eating Disorders (EDs) are severe psychiatric conditions characterized by disturbed eating behaviors and distorted body image. They are not lifestyle choices but biologically influenced medical illnesses. Understanding the psychopathology behind restriction, binging, and purging is essential for intervention. This guide dissects the diagnostic criteria, etiology, and therapeutic management of major eating disorders, providing a framework for mental health practice.

The National Eating Disorders Association (NEDA) reports 28.8 million Americans will have an eating disorder. These conditions have high mortality rates, necessitating multidisciplinary care.

Anorexia Nervosa (AN)

Characterized by persistent energy intake restriction, intense fear of weight gain, and disturbed self-perception.

Subtypes

• Restricting Type: Weight loss via dieting, fasting, or excessive exercise.
• Binge-Eating/Purging Type: Recurrent binge eating or purging (vomiting, laxatives).

Psychological Profile

Perfectionism, high harm avoidance, cognitive rigidity. Food restriction serves as a mechanism for emotional control.
Complications: Bradycardia, hypotension, lanugo, amenorrhea, osteoporosis.

Bulimia Nervosa (BN)

Recurrent binge eating followed by inappropriate compensatory behaviors (purging, fasting, exercise).

Diagnostic Criteria (DSM-5)

• Binging/compensatory behaviors occur weekly for 3 months.
• Self-evaluation unduly influenced by body shape/weight.
• Does not occur exclusively during Anorexia Nervosa episodes.

Psychological Profile

Impulsivity, emotional dysregulation, novelty seeking. Patients feel intense shame/guilt, leading to secrecy.
Complications: Electrolyte imbalances (hypokalemia), Russell’s sign, dental erosion, Mallory-Weiss tears.

Binge Eating Disorder (BED)

Recurrent episodes of eating large quantities of food quickly to discomfort; loss of control; distress/guilt afterwards; no regular compensatory behaviors.

Psychological Profile

Depression and anxiety are common comorbidities. Binging copes with negative affect.

Avoidant/Restrictive Food Intake Disorder (ARFID)

An eating disturbance manifesting as persistent failure to meet nutritional needs. Unlike Anorexia, there is no distress regarding body shape or size.
Drivers:
– Lack of interest in eating.
– Sensory aversion (texture, smell).
– Concern about aversive consequences (choking, vomiting).

Other Specified Feeding or Eating Disorder (OSFED)

Symptoms cause distress but do not meet full criteria for AN, BN, or BED.
Atypical Anorexia Nervosa: All criteria for Anorexia are met, except the individual’s weight is within or above the normal range. This presents significant medical risk despite “normal” weight.

Etiology: Biopsychosocial Model

Eating disorders stem from complex interactions.

Biological Factors

• Genetics: Heritability 50-80%.
• Neurobiology: Serotonin dysregulation (mood/appetite) and dopamine reward pathway alterations.

Neurobiological Mechanisms

Insula Dysfunction: The insula integrates sensory input with emotion. In AN, the insula may not correctly process taste or hunger signals, reducing the reward value of food.
Frontal Cortex: altered activity affects impulse control (BN/BED) or excessive rigidity (AN).

Psychological Factors

Low self-esteem, body dissatisfaction, neuroticism. Trauma history is a significant risk factor.

Sociocultural Factors

“Thin Ideal” internalization, media pressure, and weight stigma contribute to body dissatisfaction, interacting with biological vulnerability.

Co-occurring Conditions

Comorbidity is the rule, not the exception.
Substance Use Disorders: High prevalence in BN and BED (impulsivity).
Obsessive-Compulsive Disorder (OCD): High prevalence in AN (rigid rituals around food).

Evidence-Based Treatments

Multidisciplinary care is mandatory.

Cognitive Behavioral Therapy (CBT-E)

Leading treatment for BN and BED. Targets cognitive distortions regarding weight/shape and behavioral cycles.

Family-Based Treatment (FBT)

First-line for adolescents with AN. Externalizes the illness (“The disorder is the problem, not the child”) and empowers parents to refeed.

Pharmacotherapy

• SSRIs (Fluoxetine): FDA-approved for BN; reduces binge/purge frequency. Limited efficacy in acute AN.
• Lisdexamfetamine (Vyvanse): FDA-approved for moderate to severe BED.

Nursing Care and Assessment

SCOFF Questionnaire: Rapid screening tool (Sick, Control, One stone, Fat, Food).
Refeeding Syndrome: Potentially fatal electrolyte shift (hypophosphatemia) when nutrition is reintroduced. Monitor labs/vitals rigorosly.
Therapeutic Communication: Avoid commenting on appearance. Focus on feelings and function.

FAQs: Eating Disorders

Conclusion

Eating disorders are pervasive, life-threatening, and treatable. By understanding the intricate biology and psychology behind them, healthcare professionals can provide the empathetic, evidence-based care necessary for recovery.