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Related Experiment Videos

Anorexia nervosa: an evolutionary puzzle.

Nicholas Gatward1

  • 1Eating Distress Therapy Service, Department of Psychological Therapies, Chaddeslode Lodge, Shrewsbury, UK. nmgatward55@hotmail.com

European Eating Disorders Review : the Journal of the Eating Disorders Association
|August 7, 2007
PubMed
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Anorexia nervosa (AN) may stem from evolutionary threat responses. Dietary restriction, initially a defense against social exclusion and famine, can become a dangerous cycle in AN.

Area of Science:

  • Evolutionary psychology
  • Psychiatry
  • Behavioral biology

Background:

  • Anorexia nervosa (AN) is a widespread disorder with a genetic component, yet its evolutionary basis remains poorly understood.
  • The disorder's characteristics, including self-starvation and infertility, present a paradox from an evolutionary standpoint.

Purpose of the Study:

  • To propose an evolutionary explanation for Anorexia nervosa by synthesizing threat response theories.
  • To elucidate the complex features of AN that have been resistant to previous explanations.

Main Methods:

  • A theoretical synthesis integrating evolutionary concepts of threat response with the clinical presentation of AN.
  • Analysis of dietary restriction and weight gain as adaptive and maladaptive responses to perceived social and environmental threats.

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Main Results:

  • Dietary restriction in AN is hypothesized as an evolved response to perceived threats of social exclusion.
  • Weight loss may trigger an ancient adaptive response to famine, perpetuating the disorder.
  • Resumption of eating and weight gain are perceived as threatening due to re-engagement with social competition.

Conclusions:

  • This evolutionary synthesis offers a novel framework for understanding the paradoxical features of Anorexia nervosa.
  • The proposed model integrates social and survival threats to explain the disorder's persistence and complex symptomatology.