Visual illusions and plate design: The effects of plate rim widths and rim coloring on perceived food portion size

A. D. McClain, W. Van Den Bos, D. Matheson, M. Desai, S. M. McClure, T. N. Robinson

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

Objective: The Delboeuf Illusion affects perceptions of the relative sizes of concentric shapes. This study was designed to extend research on the application of the Delboeuf illusion to food on a plate by testing whether a plate's rim width and coloring influence perceptual bias to affect perceived food portion size.Design and Methods: Within-subjects experimental design. Experiment 1 tested the effect of rim width on perceived food portion size. Experiment 2 tested the effect of rim coloring on perceived food portion size. In both experiments, participants observed a series of photographic images of paired, side-by-side plates varying in designs and amounts of food. From each pair, participants were asked to select the plate that contained more food. Multilevel logistic regression examined the effects of rim width and coloring on perceived food portion size. Results: Experiment 1: participants overestimated the diameter of food portions by 5% and the visual area of food portions by 10% on plates with wider rims compared with plates with very thin rims (P<0.0001). The effect of rim width was greater with larger food portion sizes. Experiment 2: participants overestimated the diameter of food portions by 1.5% and the visual area of food portions by 3% on plates with rim coloring compared with plates with no coloring (P=0.01). The effect of rim coloring was greater with smaller food portion sizes. Conclusion: The Delboeuf illusion applies to food on a plate. Participants overestimated food portion size on plates with wider and colored rims. These findings may help design plates to influence perceptions of food portion sizes.

Original languageEnglish (US)
Pages (from-to)657-662
Number of pages6
JournalInternational Journal of Obesity
Volume38
Issue number5
DOIs
StatePublished - May 2014

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Keywords

  • dishware
  • mindless eating
  • perceptual bias
  • plate
  • portion size
  • visual illusions

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Endocrinology, Diabetes and Metabolism
  • Nutrition and Dietetics

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