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Mechanisms underlying the portion-size effect.

C Peter Herman1, Janet Polivy1, Patricia Pliner1

  • 1University of Toronto, Canada.

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This summary is machine-generated.

People eat more from larger portions, a phenomenon known as the portion-size effect (PSE). This study explores various explanations for why larger food portions lead to increased consumption.

Keywords:
AppropriatenessBite sizeFood intakePortion sizeVisual cues

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Area of Science:

  • Behavioral Economics
  • Nutritional Science
  • Psychology

Background:

  • The portion-size effect (PSE) describes the tendency to consume more food when offered larger portions.
  • Existing research suggests the PSE is a robust phenomenon, neither trivial nor easily explained by artifacts.

Purpose of the Study:

  • To critically examine the prevailing explanations and underlying mechanisms of the portion-size effect.
  • To investigate alternative hypotheses beyond the dominant 'appropriateness' norm.

Main Methods:

  • Review and analysis of existing literature on portion size and food intake.
  • Examination of evidence, including studies on young children, that challenge simple appropriateness models.
  • Exploration of alternative mechanisms such as visual cues and bite size.

Main Results:

  • The 'appropriateness' mechanism, where individuals consume what is perceived as an appropriate portion, is a dominant but not fully encompassing explanation.
  • Evidence, such as the PSE in two-year-olds, suggests limitations to the appropriateness model.
  • Alternative mechanisms, including visual cues and larger bite sizes, may also contribute to the PSE.

Conclusions:

  • The portion-size effect is a complex phenomenon influenced by multiple interacting mechanisms.
  • Further research is needed to fully elucidate the interplay of appropriateness norms, visual cues, and motoric factors in driving food intake.
  • Understanding these mechanisms is crucial for developing effective strategies to mitigate overconsumption.