Can calories be perceived and do they affect hunger in obese and nonobese humans?

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Abstract
Replaced 1 meal/day of 7 obese and 7 nonobese 22-50 yr. olds with a liquid meal of disguised caloric content for 5-10 base-line days and l4-21 experimental days. During base line, Ss received meals equicaloric with their usual meal; on experimental days, they received high- or low-calorie meals differing in caloric content by a factor of 2, but indistinguishable by taste. Ss rated their hunger and, during the experimental period, made a judgment as to which meal they had received at 7 selected times after eating. Ss showed almost no ability to identify the meals as high or low calorie, and reported hunger more in accordance with belief about caloric value than actual value. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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