Development and validation of a food photography manual, as a tool for estimation of food portion size in epidemiological dietary surveys in Tunisia

Estimation of food portion sizes has always been a challenge in dietary studies on free-living individuals. The aim of this work was to develop and validate a food photography manual to improve the accuracy of the estimated size of consumed food portions. A manual was compiled from digital photos of...

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Bibliographic Details
Published in:Libyan journal of medicine 2016-01, Vol.11 (1), p.32676-9
Main Authors: Bouchoucha, Mongia, Akrout, Mouna, Bellali, Hédia, Bouchoucha, Rim, Tarhouni, Fadwa, Mansour, Abderraouf Ben, Zouari, Béchir
Format: Article
Language:English
Subjects:
24-hour recall
Accuracy
Adolescent
Adult
Aged
Aged, 80 and over
Child
Dairy products
Diet
Diet Surveys - methods
Epidemiologic Studies
Female
Food
food portion sizes
Humans
Male
Manuals as Topic
Methods
Middle Aged
Nutrition Assessment
Original
Photography
Photography - methods
Portion Size
portion size estimation
portion size photographs
Public health
Reproducibility of Results
Size Perception
Tunisia
Tunisia - epidemiology
weighed foods
Young Adult
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Summary:Estimation of food portion sizes has always been a challenge in dietary studies on free-living individuals. The aim of this work was to develop and validate a food photography manual to improve the accuracy of the estimated size of consumed food portions. A manual was compiled from digital photos of foods commonly consumed by the Tunisian population. The food was cooked and weighed before taking digital photographs of three portion sizes. The manual was validated by comparing the method of 24-hour recall (using photos) to the reference method [food weighing (FW)]. In both the methods, the comparison focused on food intake amounts as well as nutritional issues. Validity was assessed by Bland-Altman limits of agreement. In total, 31 male and female volunteers aged 9-89 participated in the study. We focused on eight food categories and compared their estimated amounts (using the 24-hour recall method) to those actually consumed (using FW). Animal products and sweets were underestimated, whereas pasta, bread, vegetables, fruits, and dairy products were overestimated. However, the difference between the two methods is not statistically significant except for pasta (p
ISSN:1993-2820
1819-6357
DOI:10.3402/ljm.v11.32676