Abstract：
:Previous studies indicate that fructose postingestive reward for flavor preference learning is weaker than that of glucose. The present experiments explored the effects of several variables that modulate the response to fructose. In Experiment 1, ad libitum fed male rats were trained in 22 h sessions with one flavor (the CS+) paired with intragastric infusions of 7.18% fructose and another flavor (the CS-) paired with intragastric water infusion. Subsequent preference for the CS+ relative to the CS- was 90% with saccharin-sweetened flavors and only 67% with nonsweet flavors. Experiments 2 (males) and 3 (females) examined the effects of taste quality on conditioning with 16% fructose infusions. Males and females both preferred the sweet CS+ flavor (71-72%). In contrast, males avoided the nonsweet CS+ flavor (31%) and females were indifferent (47%). The different preference patterns were accompanied by differences in sweet and nonsweet training intakes and bout patterns, suggesting stimulation of intake with sweet flavor and 7.18% fructose, and satiating effects of 16% fructose. The sex difference in response to nonsweet flavors may reflect a greater sensitivity of male rats to fructose's postingestive satiating or aversive effects. Possible mechanisms for the sweet-taste enhancement of conditioning include increasing CS intakes in training, facilitating fructose metabolism and increasing flavor salience.
journal_name
Appetitejournal_title
Appetiteauthors
Ackroff K,Sclafani Adoi
10.1016/j.appet.2004.01.001subject
Has Abstractpub_date
2004-06-01 00:00:00pages
287-97issue
3eissn
0195-6663issn
1095-8304pii
S0195666304000042journal_volume
42pub_type
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