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Obesity as a major determinant of underreporting



 
 
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Old June 17th, 2004, 02:19 AM
NR
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Default Obesity as a major determinant of underreporting

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Z Ernahrungswiss 1997 Sep;36(3):229-36

Obesity as a major determinant of underreporting in a self-administered
food frequency questionnai results from the EPIC-Potsdam Study.

Voss S, Kroke A, Klipstein-Grobusch K, Boeing H
German Institute of Human Nutrition Potsdam-Rehbrucke, Unit of Medical
Epidemiology, Bergholz-Rehbrucke.

The phenomenon of underreporting of dietary intake has been observed
previously in many epidemiologic studies. In this study it was investigated
whether dependencies exist between energy intake obtained by a
semi-quantitative, self-administered food frequency questionnaire and
lifestyle or anthropometric factors, particularly obesity. The study
population consisted of 2,531 subjects, men aged 40 to 64 years and women
aged 35 to 64 years from the general population of Potsdam and the
surrounding areas. First, subjects were allocated into quintiles of the
ratio 'reported energy intake (EI)' to 'calculated basal metabolic rate
(BMR)' as a measure of age and weight adjusted energy intake. No apparent
dependencies between socio-economic variables and the ratio EI/BMR were
observed. Among anthropometric variables, BMI and related measures of
obesity were inversely related to the ratio EI/BMR in men and women. While
dietary intake was directly related to the ratio EI/BMR in absolute
quantities, energy adjusted intake of fat, protein, carbohydrate, and
alcohol was found to be independent of this ratio. Energy adjusted food
group consumption was also found to be independent of the ratio EI/BMR,
showing only slightly increasing trends across quintiles of EI/BMR for
cereals and fats, and a slightly decreasing trend for sweet foods in women.
When subjects were classified into three categories of BMI, reported energy
intake decreased across categories. Estimated energy expenditure based on
BMR was increasing with BMI categories. A close direct relationship was
observed between BMI categories and the difference between reported energy
intake and estimated energy expenditure. It is concluded that obesity is a
major determinant of under-reporting. Energy adjusted dietary variables
were found to be largely independent of such methodological influences.

NR

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