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Related Experiment Videos

How covert are covertly manipulated diets?

R J Stubbs1, S Mullen, A M Johnstone

  • 1Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen, UK. j.stubbs@rri.ac.uk

International Journal of Obesity and Related Metabolic Disorders : Journal of the International Association for the Study of Obesity
|April 25, 2001
PubMed
Summary

People cannot reliably detect differences in high-fat (HF) versus low-fat (LF) diets, even with significant nutritional changes. Sensory differences were perceived, but not linked to fat content, suggesting covert food manipulations are generally effective.

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Area of Science:

  • Nutritional Science
  • Sensory Science
  • Consumer Behavior

Background:

  • Dietary fat content significantly impacts food palatability and consumer choice.
  • Understanding sensory perception of macronutrient differences is crucial for food product development and public health initiatives.
  • Previous research suggests limited ability to discern subtle nutritional variations in foods.

Purpose of the Study:

  • To quantitatively assess the human ability to detect hedonic, sensory, and nutritional differences between covertly manipulated high-fat (HF) and low-fat (LF) diets.
  • To evaluate the effectiveness of covert dietary manipulations in food studies.
  • To determine if sensory perceptions correlate with actual fat content.

Main Methods:

  • 16 subjects (8 male, 8 female) evaluated 20 HF and 20 LF versions of manipulated foods.

Related Experiment Videos

  • Subjects assessed subjective pleasantness, perceived sensory differences (appearance, smell, taste, texture), and energy/nutrient content (energy, protein, carbohydrate, fat, fiber, sugar, salt).
  • Statistical analyses included ANOVA for pleasantness and chi-squared tests for attribute identification.

    • Main Results:

    • Subjects showed no significant average preference for HF or LF foods.
    • No consistent general differences in sensory attributes were linked to HF or LF diets, though individual food differences existed.
    • Subjects were unable to reliably distinguish HF foods (66% incorrect) and had limited success with LF foods (53% correct), with overall correct identification at 43%.

    Conclusions:

    • Individuals, on average, cannot perceive significant differences in dietary fat content when foods are manipulated covertly.
    • Covert food manipulations are generally effective, though some food types (e.g., dairy) may be more easily identified.
    • Sensory detection of differences does not equate to accurate identification of fat content.