Psychological, Social, and Physiological Factors

Core Concepts

The biopsychosocial framework

Picture three overlapping circles — biology, psychology, and social environment. Biology sets the baseline (genetic vulnerability, temperament, brain reward systems). Psychology shapes how the person thinks about food, weight, and control (perfectionism, all-or-nothing thinking, low self-esteem). The social environment supplies triggers and values (thin-ideal culture, weight teasing, family patterns, athletic or occupational pressure). A person can be vulnerable in one circle, triggered in another, and maintained in the third — hence multidisciplinary treatment (medical, nutritional, and psychological care together).

Psychological factors

Commonly described features: perfectionism, low self-esteem, body image disturbance (seeing oneself as larger than reality, or judging self-worth by weight and shape), all-or-nothing thinking ("if I eat one cookie, the day is ruined"), and difficulty regulating emotions — for some, controlling food becomes a way to feel in control when life feels chaotic. These are risk correlates, not diagnostic criteria or causes in isolation (review flag: causal direction is complex).

Social and cultural factors

• Cultural ideals of thinness: societies that idealize thinness and stigmatize larger bodies create fertile ground for body dissatisfaction.
• Media and social media: exposure to idealized images and "fitspiration" content is associated with body dissatisfaction — correlational, not simple cause-and-effect.
• Weight stigma and teasing: bullying about weight — including by family members — is among the most consistently reported risk factors.
• High-risk environments: leanness-focused sports and professions (gymnastics, wrestling, dance, modeling) are overrepresented.
• Cultural variation: eating disorders exist across cultures, but symptom content varies (review flag: verify current literature).

Physiological and biological factors

• Genetics: twin and family studies commonly estimate substantial heritability for anorexia nervosa, often cited in the ~40–60% range (review flag: estimates vary; verify current meta-analyses).
• Brain and appetite systems: research continues on reward processing, serotonin and dopamine signaling, and appetite hormones (leptin, ghrelin); these are altered by starvation and may partly normalize with nutritional rehabilitation.
• The body under starvation: prolonged restriction slows gastric emptying (early fullness), causes constipation, disrupts menstrual cycles, reduces bone density, and can affect heart muscle and electrolytes — consequences that can become medical emergencies.
• Refeeding risk: when a severely malnourished person begins eating again, rapid fluid and electrolyte shifts can be dangerous (refeeding syndrome). Nutritional rehabilitation is therefore medically supervised and never improvised; the nurse's role is recognition and escalation, per facility policy.

The Minnesota Starvation Experiment: a classic study with lessons

In 1944–45, physiologist Ancel Keys and colleagues studied 36 healthy young men at the University of Minnesota (conscientious objectors volunteering for wartime research). Fed a semi-starvation diet for six months, previously well-adjusted men became preoccupied with food (collecting recipes, dreaming about meals), developed food rituals, became irritable and withdrawn, lost interest in sex and concentration, and showed physical changes including edema and weakness.

The experiment has a double legacy. Scientifically, it showed that many behaviors associated with eating disorders — food obsession, rituals, emotional instability, withdrawal — are effects of starvation itself, not pre-existing personality flaws, which is why nutritional rehabilitation is core to eating disorder care. Ethically, it is a reminder of its era: the men volunteered under wartime conditions and consent standards far weaker than today's; some reported lasting distress.

Common Confusions