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Related Experiment Videos

Hunger, eating, and ill health.

J P Pinel1, S Assanand, D R Lehman

  • 1Department of Psychology, University of British Columbia, Vancouver, Canada. jpinel@cortex.psych.ubc.ca

The American Psychologist
|November 18, 2000
PubMed
Summary
This summary is machine-generated.

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Modern food environments promote overeating due to evolutionary adaptations for scarcity. This perspective helps explain obesity and anorexia nervosa, highlighting a mismatch between ancestral and current conditions.

Area of Science:

  • Evolutionary biology
  • Human physiology
  • Behavioral science

Background:

  • The prevailing view posits hunger and eating as compensatory mechanisms to maintain a stable energy set point.
  • However, readily available palatable foods lead to overconsumption and ill health in humans and warm-blooded animals.
  • This contradicts the energy set-point theory, suggesting an alternative evolutionary explanation.

Purpose of the Study:

  • To propose an evolutionary perspective on human eating behavior.
  • To explain the prevalence of overconsumption in modern, food-rich environments.
  • To explore the implications of this perspective for understanding eating disorders like anorexia nervosa.

Main Methods:

  • This study employs a theoretical approach, analyzing human and animal eating behaviors through an evolutionary lens.

Related Experiment Videos

  • It contrasts ancestral environments characterized by food scarcity with modern food-abundant conditions.
  • The authors examine the physiological and behavioral adaptations related to energy storage.

    • Main Results:

    • Animals evolved to eat maximally when food is available to store energy as a buffer against future scarcity.
    • Modern environments, with continuous food access, trigger these evolved hyperphagic responses, leading to overconsumption.
    • This evolutionary mismatch is proposed as a key factor in the etiology of obesity and anorexia nervosa.

    Conclusions:

    • Human eating behavior is shaped by evolutionary pressures favoring energy storage in unpredictable environments.
    • The current food-rich environment creates a maladaptive scenario, driving overconsumption and associated health issues.
    • An evolutionary framework offers new insights into the complex origins of eating disorders.