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Obese twin underreported intake by 764 calories per day, overestimated exercise by 430 calories
Wednesday, March 17, 2010 11:37 am Email this article
A new study looked at twins that came from the same egg (monozygotic twins) so that they share the same genetics, where one twin was obese, and the other was not.
The obese twins reported eating the same amount of calories as the non-obese twin (2293 calories per day reported by the obese twin versus 2341 calories for the non-obese twin), however, it was determined that the obese twins underreported their calorie intake by an average of 764 calories per day.
The obese twins also reported getting the same amount of physical exercise as the non-obese twin, however, the researchers determined that the obese twins overestimated the amount of physical activity they did by 430 calories per day. Subjects
Subjects: 14 pairs of twins, one obese, one not
The study involved 14 pairs of monozygotic twins from Finland.
All were white and 23- to 28-years-old.
Conclusion: There is considerable misreporting of calorie intake and exercise among obese people
This study “confirmed substantial differences in eating and [physical activity] behavior between obese and non-obese persons,” the authors of the study concluded.
“These may be overlooked in population studies using food and [physical activity] diaries because of considerable misreporting by the obese.”
Pietilainen K, Korkeila M, Bogl L, Westerterp K, Yki-Jarvinen H, Kaprio J, Rissanen A. Inaccuracies in food and physical activity diaries of obese subjects: Complementary evidence from doubly labeled water and co-twin assessments. Int J Obes (Lond). 2010 Mar, 34(3):437-45.
AUTHOR’S CONTACT INFORMATION
Dr. K. H. Pietiläinen
Department of Psychiatry
Obesity Research Unit
PO Box 700
Helsinki University Central Hospital
Helsinki FIN-00029, Finland
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