Palatability and foraging cost interact to control caloric intake.

标题Palatability and foraging cost interact to control caloric intake.
文章类型Journal Article
作者Ackroff, K., & Sclafani A.
期刊Journal of experimental psychology. Animal behavior processes
发表日期1999 Jan
关键词Animals, Appetitive Behavior, Drinking, Energy Intake, Male, Motivation, Nutritive Value, Rats, Satiety Response, Taste, 味觉生理, 嗅觉生理

The combined effects of meal cost and food flavor on meal size were studied with a method that avoided the covariation of nutrient composition and caloric density with palatability. As rats (Rattus norvegicus) drank flavored fluids (unpalatable 0.05% sucrose octaacetate [SOA], neutral 0.05% saccharin, and palatable 2% Polycose + 0.2% saccharin [P + S]), liquid diet was infused intragastrically. Relative to saccharin, rats with free access ate 10% more calories in larger meals while consuming P + S and initially ate fewer calories in smaller but more frequent meals while drinking SOA. Other rats lever-pressed to begin meals, which halved meal number and doubled meal size relative to the free-access group. Although foraging rats also ate larger P + S meals and smaller SOA meals, the changes did not affect total intake. Without the usual differential postingestive effects of foods that differ in palatability, making food more costly blunts rats' response to its flavor.

Alternate JournalJ Exp Psychol Anim Behav Process