Assessment of the Accuracy of Portion Size Reports Using Computer-Based Food Photographs Aids in the Development of an Automated Self-Administered 24-Hour Recall (original) (raw)
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British Journal of Nutrition, 1996
The aim of the present study was to determine the errors in the conceptualization of portion size using photographs. Male and female volunteers aged 18–90 years (n 136) from a wide variety of social and occupational backgrounds completed 602 assessments of portion size in relation to food photographs. Subjects served themselves between four and six foods at one meal (breakfast, lunch or dinner). Portion sizes were weighed by the investigators at the time of serving, and any waste was weighed at the end of the meal. Within 5 min of the end of the meal, subjects were shown photographs depicting each of the foods just consumed. For each food there were eight photographs showing portion sizes in equal increments from the 5th to the 95th centile of the distribution of portion weights observed in The Dietary and Nutritional Survey of British Adults (Gregory et al. 1990). Subjects were asked to indicate on a visual analogue scale the size of the portion consumed in relation to the eight ph...
2015
The aim of the present study was to develop life-sized food photographs as a tool for dietary intake assessment. This was an experimental study and used weighed record method to measure the dietary intake of subjects and a one-day 24-hour recall method was used to compare with the weighed record method. A total of fifteen subjects of Universiti Putra Malaysia staff with monthly household income below than MYR2300 (low income) were selected. From a hundred and sixteen food items were photographed, eleven of them were chosen for validation. A paired samples t-test showed that the percent weight differences between weighed record and 24-hour recall methods was between -10.7 to 5.3%, and foods that had definitive shape and form couldn't be estimated by the subjects. A correlation analyses between the two methods shows that there was a significant correlation (p<0.01) between these two methods. Nutrient intake analyses show that macronutrient intakes differed between 8.1 to 11%, w...
Subjects’ Perception in Quantifying Printed and Digital Photos of Food Portions
Nutrients, 2019
Although digital photos have the potential to improve the precision of reported portions in dietary assessment, there are few studies investigating its accuracy in comparison to printed photos. The aim of this study was to evaluate the perception of adults in quantifying food portion sizes using printed and digital photos, displayed on computer-screens and tablets. In total, 1165 evaluations were performed for 60 photos of portion sizes in Brazil. Each participant (n = 58) attended two sessions in the study center, with an interval of at least one week. In each session, twelve food portions were prepared and randomly evaluated by each participant in its printed and digital forms. The mean error (difference between the estimated and true portions) was not significantly different between the printed photos (2.1 g ± 47.2) and the digital ones (−6.4 g ± 53.7). The agreement on using the printed and digital photos was 91% and 90%, respectively. Furthermore, the use of the tablet was more...
Accuracy in the estimation of food servings against the portions in food photographs
European Journal of Clinical Nutrition, 2008
Objective:In diet surveys, quantitative underestimation of food consumption may be due to intentional misreporting or false portion-size reporting. Perception of food photographs used as aids for assessing the actual amounts may have an effect. This study was carried out to assess the validity of food photographs.Design:A real-time test protocol where 52 presented food servings were compared against photographed portions with
Evaluation of food photographs for 24-hour recall method
1995
The purpose of this study was to develop a visual aid to improve and increase accuracy of the 24hour recall method. This aid in the form of a booklet, consists of life-sized photographs of common Malaysian foods, accompanied by the weight of its edible portion and nutrient values. These photographs used together with the recall method were tested against the weighed record method for its validity. For this preliminary test, a total of 23 photographs of food items were tested. Sixty healthy adult volunteers were selected as respondents for the test. These respondents were divided into 2 groups. Each group was given either a simple or complicated menus. The respondents were served 3 test meals: breakfast, lunch and tea. Each food item served and plate waste were weighed and recorded. The 24-hour recall was conducted the day following the weighed record day. The results of the paired t-tests indicated no significant difference in group’s mean weights of food intake between the weighed ...
JMIR Research Protocols, 2021
Background The assessment of dietary intake underpins population nutrition surveillance and nutritional epidemiology and is essential to inform effective public health policies and programs. Technological advances in dietary assessment that use images and automated methods have the potential to improve accuracy, respondent burden, and cost; however, they need to be evaluated to inform large-scale use. Objective The aim of this study is to compare the accuracy, acceptability, and cost-effectiveness of 3 technology-assisted 24-hour dietary recall (24HR) methods relative to observed intake across 3 meals. Methods Using a controlled feeding study design, 24HR data collected using 3 methods will be obtained for comparison with observed intake. A total of 150 healthy adults, aged 18 to 70 years, will be recruited and will complete web-based demographic and psychosocial questionnaires and cognitive tests. Participants will attend a university study center on 3 separate days to consume brea...
Nutrition & Dietetics, 2010
Aim: Technology is being used increasingly for dietary assessment, to streamline and improve the efficiency. These technologies allow for the inclusion of visual food portion images within the assessments rather than in addition to them as previously required. This paper describes the methodology for creating these food portion images using an online dietary assessment website (DietAdvice) as an example technology. The images include country-specific Australian food items, not previously available. Methods: Foods contained in the DietAdvice website were assessed to determine the number requiring food portion images. Preparation methods, recipes and portion sizes were determined for the foods, which varied from single foods through to cooked dishes and beverages. Foods were photographed by a professional photographer against a white background on a standard dinner plate or bowl with a standard of reference in each frame. Results: Approximately 200 food items required images, with varying portion sizes ranging from two to eight images per food item. Six hundred and thirty-one photographs were taken. Food such as ice-cream, burritos and fruit needed to be photographed quickly to prevent deterioration and ensure a quality real-to-life photographs. Conclusion: The art of photographing food portions itself is a difficult task. Inappropriate angles or lighting can make the food appear larger or smaller than it actually is. Timing is critical as the food can melt, wilt, collapse or discolour if the photo is not taken promptly. Clear labelling and a standard of reference for all photographs was necessary. The developed food portion images will allow users of the DietAdvice website to estimate portion sizes more accurately than text-based sizes alone, although validation is required.
Development of a Photographic Food Atlas as a Portion Size Estimation Kit for Malaysian
Journal of nutritional science and vitaminology, 2020
A photographic food atlas is a series of photographs showing different quantities of different foods. It serves as a portion size estimation aid (PSEA). In Malaysia, the existing food atlases, which display foods in exchanges and standard portion sizes, may not be representative of the actual sizes of the portions of food consumed by the local population. This paper aims to describe the development of a food atlas, namely the 'MY Food Album', and assess its usability as a PSEA. Thirty four participants (aged 31.6±20.9 y) served themselves, in a laboratory setting, what they considered to be typical, small, medium, and large portions of 23 amorphus food items. All food portions were weighed to obtain the mean and standard deviation of the range of food portion sizes to be displayed in the food atlas. Using standard camera and lighting settings, various local foods were photographed at an angle of 45º. A total of 393 food items were categorized into 14 food groups and presente...
Objective: To evaluate how well respondents perceive digital images of food portions commonly consumed in Greece. Design: The picture series was defined on the basis of usual dietary intakes assessed in earlier large-scale studies in Greece. The evaluation included 2218 pre-weighed actual portions shown to participants, who were subsequently asked to link each portion to a food picture. Mean differences between picture numbers selected and portions actually shown were compared using the Wilcoxon paired signed-rank test. The effect of personal characteristics on participants’ selections was evaluated through unpaired t tests (sex and school years) or through Tukey–Kramer pairwise comparisons (age and food groups). Setting: Testing of participants’ perception of digital food images used in the Greek national nutrition survey. Subjects: Individuals (n 103, 61% females) aged 12 years and over, selected on the basis of the target population of the Greek nutrition survey using convenience sampling. Results: Individuals selected the correct or adjacent image in about 90% of the assessments and tended to overestimate small and underestimate large quantities. Photographs of Greek traditional pies and meat-based pastry dishes led participants to perceive the amounts in the photos larger than they actually were. Adolescents were more prone to underestimating food quantities through the pictures. Conclusions: The digital food atlas appears generally suitable to be used for the estimation of average food intakes in large-scale dietary surveys in Greece. However, individuals who consistently consume only small or only large food portions may have biased perceptions in relation to others.