Preoccupation, food, and failure: an investigation of cognitive performance deficits in dieters.
OBJECTIVE
This study tested two explanations of the cognitive performance deficits of dieters. First, these deficits are due to the metabolic consequences of food deprivation. Second, they are psychological in origin (i.e., preoccupation with dieting-related thoughts during dieting depletes the cognitive resources available for nondieting tasks).


METHODS
Dieters and nondieters performed a battery of cognitive tasks before and after consumption of a high-energy chocolate bar. Eating the chocolate bar was expected to reverse the effects of food deprivation but, as a "diet-threatening" food, it could increase dieting-related preoccupation.


CONCLUSIONS
The results supported the latter prediction. Performance on a memory task was further impaired, rather than improved, after food consumption in dieters. In addition, dieters experienced a significant increase in the number of food and dieting-related thoughts. Some dieters attributed their poorer performance to distraction by these thoughts. Marked individual differences in thought content accounted for some of the variability in the effects on performance.
Jones
Nicola
N
Department of Experimental Psychology, University of Bristol, Bristol, United Kingdom.
Rogers
Peter J
PJ
D000293:Adolescent; D000328:Adult; D001007:Anxiety / Q000175:diagnosis / Q000453:epidemiology / Q000523:psychology*; D001143:Arousal / Q000502:physiology; D003072:Cognition Disorders / Q000453:epidemiology / Q000209:etiology*; D003866:Depressive Disorder / Q000175:diagnosis / Q000453:epidemiology / Q000523:psychology; D004032:Diet / Q000523:psychology*; D005260:Female; D005502:Food; D006801:Humans; D008875:Middle Aged; D009483:Neuropsychological Tests; D011930:Reaction Time; D012649:Self Concept; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires; D013850:Thinking