Effect of making duplicate food collections on nutrient intakes calculated from diet records

Abstract

In a 1-yr study in which food intakes were recorded daily, subjects were asked to make duplicate food collections for 1 wk during each of the four seasons. Mean calculated energy intake of the 29 subjects was 12.9% less during the food collection periods than the mean for the entire year (which included collection periods). There were also significant reductions in the reported intake of all nutrients during the collection periods. Protein, vitamin A, saturated fat, and cholesterol intakes were decreased to the greatest extent. The actual decrease in energy intake was greater for the males than for the females, but the percentage was the same (12.9%). The younger group of subjects (less than or equal to 35) decreased energy intake 16.8% and the older group (greater than 35) 8.8%. Comparison of intakes during collection periods with intakes the week before and the week after showed that 28 of the 29 subjects decreased their energy intake from 1.1 to 32.3%. These data suggest that intakes of subjects during food collection periods do not represent their habitual levels of intake reported throughout the year.

Macronutrient, Copper, and Zinc Intakes of Young German Children as Determined by Duplicate Food Samples and Diet Records

“…This probably shows that on collect days the parents of the subjects gave a deliberately or non-deliberately distorted or wrong estimation of the quantities consumed. This type of problem has also been noted by several authors, and the differences have been attributed partly to the increased number of tasks to be per formed when food collections were made and also to a guilty feeling about wasting food which went into the collection jar [9], Analysis of food composites resulted in sig nificant lower values in both boys and girls for energy, protein, and fat than the calculated values from records of the corresponding days. In contrast, the analytical values of car bohydrates were higher than those of the cor responding collect days.…”

Population-based dietary intakes and tap water concentrations for selected elements in the EPA Region V National Human Exposure Assessment Survey (NHEXAS)

“…Pilot testing of these duplicate diet methodologies, however, found laboratory-analyzed caloric contents of collected foods that were on average 12% to 16% lower than energy intake estimates from detailed food records and calculated energy expenditures (Thomas et al, 1997). Biases in the range of 6% to 25% have been reported by other researchers (Kim et al, 1984;Stockley, 1985;Bro et al, 1990). It is likely that similar bias estimates are applicable to the intake measurements in this study.…”

Comparison of food composition tables and direct chemical analysis for the assessment of macronutrient intake in a military community

“…methods are available to assess food intake (Dwyer, 1994). While prospective methods are generally preferable for they are less subject to forgetfulness, they may inadvertently stimulate a greater consciousness about intake or otherwise lead the subject to alter intakes during the recording periods (Kim et al, 1984). In this study we collected duplicate portions of food eaten by cadets.…”