The relationships between the resting energy expenditure (REE), measured by indirect calorimetry, and eating behavior, assessed by the "Three Factor Eating Questionnaire" were evaluated. The study was carried out in a group of healthy never-obese subjects and in two groups of formerly obese people, who have maintained a normal weight for more than two years. The subjects of the first formerly obese group had brought their body weight to normal by dieting. The second one comprised subjects following biliopancreatic diversion for obesity (BPD) in the long term, who maintain a normal weight because of the intestinal malabsorption due to the operation regardless of food consumption. In comparison with the other subjects, significantly higher cognitive restraint score values were observed in the post-diet subjects. Furthermore, a negative significant correlation between cognitive restraint and REE was found in the non operated subjects, while such correlation was not present in the BPD subjects. Therefore, in normal people cognitive restraint has to be considered to be related to behavioral-cognitive factors rather than biologically driven by energy requirements.
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