Biological explanations for anorexia nervosa

Genetic factors:
- Twin studies show higher concordance in identical twins, suggesting a hereditary component to anorexia nervosa. 👥 Holland et al. (1988) found concordance rates of 56% for identical twins compared to 5% for non-identical twins.
- More recent studies have linked AN to particular genes affecting serotonin and dopamine functioning (👥 Kaye et al., 2001), which are neurotransmitters involved in mood regulation and appetite control. Such findings suggest that individuals may inherit a predisposition to anorexia. However, concordance is far from 100%, indicating that environmental influences must also play a role.
Neural factors:
- Serotonin dysregulation has been associated with the anxiety and appetite suppression seen in anorexia nervosa. 👥 Bailer et al. (2011) found evidence of altered serotonin activity in anorexic patients even after recovery.
- Dopamine abnormalities may contribute to a reduced sense of reward from food, explaining why individuals with anorexia nervosa derive little pleasure from eating.
- Brain imaging studies show abnormal hypothalamic activity in anorexia patients, though this may reflect the consequences of starvation rather than its cause. Thus, biological explanations are valuable but incomplete, as they do not account for cultural influences.

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