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Chemosensory Perception

, Volume 6, Issue 2, pp 70–77 | Cite as

The Test–Retest Reliability of Fatty Acid Taste Thresholds

  • Lisa P. Newman
  • Russell S. J. Keast
Article

Abstract

Emerging evidence supports the existence of a fat specific oral detection system activated by fatty acids, which conveys the presence of fat in foods. Stability in psychophysical measurement of fatty acids is an essential step in supporting the existence of an oral fat detection system as well as supporting the association between fatty acid taste and development of obesity. This study aimed to determine the test–retest reliability of oral fatty acid thresholds. Seventeen subjects (eight males, age 31 ± 2.3 years, BMI 22.9 ± 0.6 kg/m2, nine females, age 29 ± 1.8 years, BMI 23.4 ± 0.9 kg/m2) attended 30 laboratory sessions to determine oral detection thresholds for oleic acid (C18:1), linoleic acid (C18:2) and lauric acid (C12:0). Taste thresholds were also performed using sucrose (sweet), citric acid (sour), sodium chloride (salty), caffeine (bitter) and monosodium glutamate (umami). Each stimulus was evaluated on six occasions using ascending forced choice triangle tests, over 2 days. Diet records were also collected prior to each testing session. Fatty acid taste thresholds were determined for all subjects and strong intra-class correlations were found for within day and across day testing sessions for C18:1, C18:2 and C12:0. The strongest correlations were found for across day testing for C18:1 [intra-class correlation (ICC) = 0.78, confidence interval (CI) = 0.49–0.91], C18:2 (ICC = 0.94, CI = 0.84–0.98) and C12:0 (ICC = 0.80, CI = 0.54–0.92). Strong correlations were also found for sweet, sour, salty, bitter and umami tastes (ICC range, 0.7–0.9). This study provides evidence supportive of an oral fatty acid specific detection system.

Keywords

Detection threshold Fatty acid taste Lauric acid Linoleic acid Oleic acid Test–retest reliability 

Abbreviations

C18:1

Oleic acid

C18:2

Linoleic acid

C12:0

Lauric acid

MSG

Monosodium glutamate

CD36

Cluster of differentiation 36

GPR

G Protein Coupled Receptors

Notes

Conflict of Interest

None

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  1. 1.Centre for Physical Activity and Nutrition Research, School of Exercise and Nutrition SciencesDeakin UniversityMelbourneAustralia

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