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Sensory changes and preservation with age: Hope for the undernourished

Published online by Cambridge University Press:  19 October 2012

C. Withers* ,
M. Dermiki ,
M. A. Gosney ,
R. Crabtree ,
O. B. Kennedy  and
L. Methven
C. Withers*
Affiliation:
Department of Food and Nutritional Sciences, University of Reading, UK
M. Dermiki
Affiliation:
Department of Food and Nutritional Sciences, University of Reading, UK
M. A. Gosney
Affiliation:
Clinical Health Sciences, University of Reading, UK
R. Crabtree
Affiliation:
Department of Food and Nutritional Sciences, University of Reading, UK
O. B. Kennedy
Affiliation:
Department of Food and Nutritional Sciences, University of Reading, UK
L. Methven
Affiliation:
Department of Food and Nutritional Sciences, University of Reading, UK
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Abstract

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Abstract
Information
Proceedings of the Nutrition Society , Volume 71 , Issue OCE2: Summer Meeting hosted by the Irish Section, 16–19 July 2012, Translational nutrition: integrating research, practice and policy , 2012 , E48
Copyright
Copyright © The Authors 2012

Undernutrition affects around 32% of adults aged over 65[ 1 ]. In 2007, 239 patients died of undernutrition, a condition that is badly underreported in hospitals and care homes[ 2 ]. Reduced food consumption could relate to changes in sensory perception with age[ Reference Koskinen and Tuorila 3 ]. Frequent attempts have been made to enhance food products for older adult groups[ Reference Griep, Mets and Massart 4 – Reference Koskinen, Nenonen and Tuorila 7 ], however understanding age-related effects taste, olfaction, flavour and texture perception would provide insight into enhancing older patient nutrition. In a series of investigations, detection thresholds, discrimination thresholds and just-about-right tests, were used to understand age-related sensory changes. This study investigated the perception of basic tastes, ortho- and retro-nasal flavour perception and mouth-feel characteristics in healthy older and younger adults.

Older adults (n=25–32 aged 65–88) had significantly higher thresholds than younger adults for salt (p=0.004) and sweet (p<0.001), but not bitter and umami tastes (n=25–60, aged 20–40) (Table 1). This contradicts previous findings, which have suggested bitter taste decline and the preservation of sweet perception[ Reference Spitzer 8 – Reference Murphy and Gilmore 12 ].

Ortho- and retro-nasal detection thresholds for two flavour compounds assessed were significantly higher in older adults. 2,5-Dimethyl pyrazine ortho-nasal thresholds were 2.3 times higher in older adults (p=0.05), and retro-nasal thresholds were 3.7 times higher (p=0.006). Dimethyl disulfide detection also increased with age both ortho-nasally by 4.8 times (p=0.001) and retro-nasally by 7 times (p=0.003). However, at suprathreshold levels, ortho-nasal discrimination of caramel flavour and vanillin in skimmed milk was not age dependent, suggesting older adults discriminate flavours above threshold levels easily. These findings agree with previous studies, finding olfactory and flavour perception decline is compound specific[ Reference Stevens and Spencer 13 ].

No significant age effects were found for the perception of thickness or mouth-coating in dairy beverages. Older volunteers even exhibited greater sensitivity to mouth-drying than younger adults (p=0.03). These findings suggest that while taste and olfactory acuity can decline with age, texture and suprathreshold flavour perception is not age-dependent. The preservation of texture perception could even cause older adults to place more emphasis on mouth-feel characteristics, when compensating for sensory losses. Hospitals, care-homes and the food industry should take note of sensory preservation with age, especially when targeting foods and beverages towards older adults and patients.

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