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The Effect of Eating Style and Portion Size on the Accuracy of Dietary Self-Monitoring Among Normal Weight and Overweight Women

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Technical Report

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Uniformed Services University Of The Health Sciences Bethesda United States

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Given the dramatic rise in obesity and related disorders, it is imperative to improve the accuracy of dietary self-monitoring, a cornerstone of treatment. Anambulatory self-monitoring study and a laboratory food estimation study were used to examine 1 the role of eating style gorging and weight status obesity in dietary underreporting and 2 portion size as mechanism underlying dietary underreporting. Gorging was defined as two or fewer meals per day with at least seven hours between waking and the first meal. Obese was defined as a BMI between 25 and 34.9 kgm2. Seventy-six women, ages 19-50 participated. A 2 x 2 weight by eating style between groups one-week ambulatory study design was used to examine the accuracy of dietary self-monitoring. Reported energy intake EI, from a self-monitoring eating diary, was compared to measured energy needs assessed by an ambulatory activity monitor. Accuracy was determined by the Goldberg equation and the ratio of energy intake to energy expenditure EIEE. Overweight and gorgers were expected to underestimate EI as compared to normal weight and non-gorgers, respectively. Overweight gorgers were expected to underestimate EI compared to all other groups.

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