Heritability estimates for anorexia nervosa are at roughly:

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Heritability estimates for anorexia nervosa are around 50 percent, meaning that genetic factors account for about half of the risk of developing the disorder. Environmental factors also play a role, such as cultural pressures to be thin and personal experiences of trauma or stress. However, twin and family studies have consistently found a significant genetic component to anorexia nervosa.

Heritability Estimates for Anorexia Nervosa Are at Roughly