Anorexia nervosa is an eating disorder and psychological condition marked by extreme self-starvation due to a distorted body image . People with anorexia think they are fat, regardless of how much they weigh, and are obsessive about monitoring their weight and the food they consume. They may regularly refuse to eat or eat only minimal amounts of food.
Why Does Anorexia Nervosa Develop?
Understanding what causes anorexia nervosa is essential for prevention and treatment. Research consistently shows that anorexia nervosa arises from a complex interplay of biological, psychological, and social factors — rarely from a single cause.
Core Causes and Triggers
Anorexia nervosa and other eating disorders are commonly found in cultures and settings where "being thin" is seen as desirable. Stressful life events can play a role in triggering the disorder, as can temperamental factors, such as perfectionism and obsessional traits. Biology and heredity seem to contribute to vulnerability as well, as individuals are more likely to develop the disorder if another family member has experienced it. Anorexia emerges due to genetics , personality traits, and environmental factors. An individual is more likely to develop it if a family member has the disorder, s
Biological Factors
Biological contributors to anorexia nervosa include:
- Genetics: Family history increases risk; certain genes influence vulnerability
- Brain chemistry: Neurotransmitter imbalances (serotonin, dopamine, norepinephrine) play key roles
- Brain structure: Differences in the prefrontal cortex, amygdala, and hippocampus are documented
- Physical health: Chronic illness, hormonal changes, and sleep disruption can trigger or worsen anorexia nervosa
Psychological Factors
- Early experiences: Childhood adversity, attachment disruption, and trauma shape psychological vulnerability
- Cognitive patterns: Negative thinking styles, perfectionism, and rumination increase risk
- Coping skills: Limited emotional regulation skills make anorexia nervosa more likely under stress
- Personality: Certain traits (neuroticism, harm avoidance) are associated with higher risk
Social and Environmental Factors
Environmental factors — including chronic stress, relationship problems, financial difficulty, and major life events — can trigger anorexia nervosa in vulnerable individuals.
What Triggers an Episode?
Even in people with predisposing factors, anorexia nervosa often requires a triggering event:
- Major life transitions (job loss, relationship breakdown, bereavement)
- Prolonged stress without adequate recovery
- Substance use or withdrawal
- Physical illness or injury
- Social isolation or conflict
Protective Factors
Not everyone with risk factors develops anorexia nervosa. Protective factors include: strong social support, effective coping skills, physical health maintenance, access to care, and psychological resilience built through prior challenges.