7/30/13, New Orleans, LA. Research to be presented at the Annual Meeting of the Society for the Study of Ingestive Behavior (SSIB), the foremost society for research into all aspects of eating and drinking behavior, found that aging elicits changes in taste preferences and that such changes appear to be independent of taste nerve activity.
In humans and animals aging decreases dietary and energy requirements and it is generally believed that reduced consumption is related to alterations in taste preference. However, the mechanisms underlying an age-induced shift in taste preference remain unclear. Thus, the researchers investigated differences in fluid intake and taste nerve responses across different age groups of rats.
The researchers initially measured the intake of sweet, salty, umami, sour or bitter taste solutions in 5 age groups; juvenile, young-adult, adult, middle-aged and old-aged male rats. The result showed that older animals exhibit a decreased preference for sweet and umami taste and a reduced aversion to bitter taste.
Additional behavioral studies examined whether aging alters taste thresholds by measuring the consumption of simultaneously presented high- and low-concentrated taste solutions. This work revealed that taste sensitivity is lower in older rats.
To elucidate the neural mechanisms of such age-related changes in taste preference and sensitivity, electrophysiological experiments examined taste response characteristics of chorda tympani nerves. These nerves mediate gustatory information from the tongue to the brainstem. The researchers observed no significant differences in activity of the chorda tympani nerves by taste stimuli across the different age groups.
Overall, these behavioral and electrophysiological studies demonstrate that age-related changes in taste preference and sensitivity are independent of the peripheral gustatory system.
The lead author of the study, Chizuko Inui-Ya
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Society for the Study of Ingestive Behavior