Discrepancy between self-reported and actual caloric intake and exercise in obese subjects
| Autor: | Steven B. Heymsfield, Steven W. Lichtman, Hope Weisel, Stanley Heshka, Michele Pestone, Krystyna Pisarska, Dwight E. Matthews, Hillary J. Dowling, Ellen Raynes Berman, Esther G. Offenbacher |
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| Rok vydání: | 1992 |
| Předmět: |
Male
medicine.medical_specialty Calorie Diet Reducing Physiology Physical exercise Calorimetry Truth Disclosure Total energy expenditure Internal medicine medicine Humans Obesity Exercise Psychological Tests business.industry Significant difference General Medicine Middle Aged medicine.disease Caloric intake Endocrinology Basal metabolic rate Obese subjects Female business Energy Intake Energy Metabolism |
| Zdroj: | The New England journal of medicine. 327(27) |
| ISSN: | 0028-4793 |
| Popis: | Some obese subjects repeatedly fail to lose weight even though they report restricting their caloric intake to less than 1200 kcal per day. We studied two explanations for this apparent resistance to diet--low total energy expenditure and underreporting of caloric intake--in 224 consecutive obese subjects presenting for treatment. Group 1 consisted of nine women and one man with a history of diet resistance in whom we evaluated total energy expenditure and its main thermogenic components and actual energy intake for 14 days by indirect calorimetry and analysis of body composition. Group 2, subgroups of which served as controls in the various evaluations, consisted of 67 women and 13 men with no history of diet resistance.Total energy expenditure and resting metabolic rate in the subjects with diet resistance (group 1) were within 5 percent of the predicted values for body composition, and there was no significant difference between groups 1 and 2 in the thermic effects of food and exercise. Low energy expenditure was thus excluded as a mechanism of self-reported diet resistance. In contrast, the subjects in group 1 underreported their actual food intake by an average (+/- SD) of 47 +/- 16 percent and overreported their physical activity by 51 +/- 75 percent. Although the subjects in group 1 had no distinct psychopathologic characteristics, they perceived a genetic cause for their obesity, used thyroid medication at a high frequency, and described their eating behavior as relatively normal (all P0.05 as compared with group 2).The failure of some obese subjects to lose weight while eating a diet they report as low in calories is due to an energy intake substantially higher than reported and an overestimation of physical activity, not to an abnormality in thermogenesis. |
| Databáze: | OpenAIRE |
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