Featured Research

from universities, journals, and other organizations

Taste preference changes in different life stages of rats

Date:
July 30, 2013
Source:
Society for the Study of Ingestive Behavior
Summary:
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.

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-Yamamoto, Ph.D. states, "To our knowledge, this is the first report demonstrating a reduced aversion to bitter taste in aged rats." She comments, "We had expected that these changes were due to the peripheral taste system." However, differences in electrophysiological recording of taste responses of the chorda tympani nerves across age groups were not observed. "Our studies showed that aging elicited no changes in transmission of taste information from the tongue to the central nervous system. Thus, our future work will investigate the role of the central nervous system in mediating age-induced changes in taste preference," says Inui-Yamamoto.


Story Source:

The above story is based on materials provided by Society for the Study of Ingestive Behavior. Note: Materials may be edited for content and length.


Cite This Page:

Society for the Study of Ingestive Behavior. "Taste preference changes in different life stages of rats." ScienceDaily. ScienceDaily, 30 July 2013. <www.sciencedaily.com/releases/2013/07/130730091403.htm>.
Society for the Study of Ingestive Behavior. (2013, July 30). Taste preference changes in different life stages of rats. ScienceDaily. Retrieved July 22, 2014 from www.sciencedaily.com/releases/2013/07/130730091403.htm
Society for the Study of Ingestive Behavior. "Taste preference changes in different life stages of rats." ScienceDaily. www.sciencedaily.com/releases/2013/07/130730091403.htm (accessed July 22, 2014).

Share This




More Plants & Animals News

Tuesday, July 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

San Diego Zoo Welcomes New, Rare Rhino Calf

San Diego Zoo Welcomes New, Rare Rhino Calf

Reuters - US Online Video (July 21, 2014) An endangered black rhino baby is the newest resident at the San Diego Zoo. Sasha Salama reports. Video provided by Reuters
Powered by NewsLook.com
Shark Sightings a Big Catch for Cape Tourism

Shark Sightings a Big Catch for Cape Tourism

AP (July 21, 2014) A rise in shark sightings along the shores of Chatham, Massachusetts is driving a surge of eager vacationers to the beach town looking to catch a glimpse of a great white. (July 21) Video provided by AP
Powered by NewsLook.com
$23.6 Billion Awarded To Widow In Smoking Lawsuit

$23.6 Billion Awarded To Widow In Smoking Lawsuit

Newsy (July 20, 2014) Cynthia Robinson claims R.J. Reynolds Tobacco Company hid the health and addiction risks of its products, leading to the death of her husband in 1996. Video provided by Newsy
Powered by NewsLook.com
A Centuries' Old British Tradition Is Far from a Swan Song

A Centuries' Old British Tradition Is Far from a Swan Song

AFP (July 19, 2014) As if it weren't enough that the Queen is the Sovereign of the UK and 15 other Commonwealth realms, she is also the owner of all Britain's unmarked swans. Duration: 02:18 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins