Children's estimates of food portion size: The effect of timing of dietary interview on the accuracy of children's portion size estimates

Human Nutrition Research Centre, School of Clinical Medical Sciences, University of Newcastle, Room M1151, 1st Floor, William Leech Building, Framlington Place, Newcastle upon Tyne, NE2 4HH, UK.
British Journal Of Nutrition (Impact Factor: 3.45). 02/2008; 99(1):185-90. DOI: 10.1017/S0007114507791882
Source: PubMed


For food intakes to be converted into nutrient intakes a measure or estimate of the amount of food consumed is required. A number of methods have been developed to assist subjects in providing an estimate of portion size. Children's ability to use perception, conceptualisation and memory skills to estimate food portion size has not been investigated systematically. The aim of the present study was to test the effect of the timing of a dietary interview on the accuracy of estimates of food portion sizes made by children, using food photographs, food models and an interactive portion size assessment system, developed for use with children and based on portion sizes of foods consumed by children. Children (n 108) aged 4-14 years were supplied with known quantities of foods and asked to estimate the portion size of each food using each of the three portion size assessment tools. Interviews took place (a) with the food in view, (b) just after the child had eaten the food or (c) 24 h after the child had eaten the food. There were no significant differences in children's ability to estimate food portion size (either as served or as eaten) with timing of interview. That is, children were as accurate in their estimates of portion size 24 h after consuming the food as when the food was in view. Under these conditions many children were able to estimate food portion size utilising perception, conceptualisation and memory skills.

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Available from: Karen L Barton, Jan 27, 2014
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    • "There were no significant differences in the childrens' ability to estimate portion size with timing of interview (Foster et al., 2008b). Therefore, the main focus of the pilot study was on the 24-h recall interview because this is the situation in which the tools would most likely be used. "
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    ABSTRACT: Novel methods of assessing dietary intake are required to reduce the participant burden in dietary surveys, improve participation rates and thereby improve the representativeness of the sample and minimise the impact of measuring dietary intake on a subject's food intake during the recording period. One method of reducing the burden placed on participants in recording dietary intake is to replace weighing of foods with estimation of portion size using tools such as food photographs. The interactive portion size assessment system (IPSAS) is an interactive portion size assessment system for use in assessing portion sizes of foods consumed by children aged 18 months to 16 years. The system is computer-based and is designed to be administered during an interview for a food diary or 24-h recall. The portion sizes depicted are age-specific and based on the weights of foods served to children during the UK National Diet and Nutrition Surveys. The system displays digital images of food used to estimate the amount of each food served to the child and the amount of any food left over. Foods are categorised within the system using a three-tier structure. Twenty-seven food group icons are used with two further drop-down menus to select first the food group, then the food category and, finally, the actual food product. Each food is linked to UK food composition codes and all photographs are linked to the weight of the food depicted. Nutritional output is via a companion database. The present study describes the development of the IPSAS and the structure of the system.
    Journal of Human Nutrition and Dietetics 05/2013; 27(s1). DOI:10.1111/jhn.12127 · 1.99 Impact Factor
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    01/2001: pages 3–39; Elsevier Academic Press.
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