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Related Experiment Videos

Is fat perception a thermal effect?

J F Prinz1, R A de Wijk, L A H Huntjens

  • 1Wageningen Centre for Food Science, 6700AN Wageningen, The Netherlands. Jon.Prinz@wur.NL

Perceptual and Motor Skills
|June 15, 2007
PubMed
Summary
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Humans may detect fat content not just by taste or texture, but also by how it affects food

Area of Science:

  • Food science
  • Sensory science
  • Human physiology

Background:

  • Traditionally, fat perception is attributed to flavor and oral lubrication.
  • Recent findings suggest a strong correlation between perceived temperature and fat content, hinting at an alternative detection mechanism.
  • This challenges existing models of fat sensory perception.

Purpose of the Study:

  • To investigate the role of oral thermal sensitivity in fat perception.
  • To determine if human oral thermal receptors are capable of detecting subtle temperature changes related to fat content.
  • To explore the potential of thermal conductivity as a primary cue for fat detection.

Main Methods:

  • Assessed thermal sensitivity of lips and oral mucosa using a Peltier device.

Related Experiment Videos

  • Measured detection thresholds for small temperature fluctuations (0.08°C to 1.36°C) on the lips and tongue.
  • Analyzed the rate of temperature change in foods (custards, mayonnaises) after oral ingestion and expectoration.

    • Main Results:

    • Lips demonstrated high sensitivity to minor temperature variations.
    • Oral thermal receptors are sufficiently rapid and accurate to play a role in fat perception.
    • Calculated heating rates of foods in the mouth correlated with their fat content.

    Conclusions:

    • Fat content may be perceived through the thermal conductivity of food.
    • Oral thermal sensitivity offers a novel pathway for detecting fat.
    • This research opens new avenues for understanding food texture and sensory properties.