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Validation of digital photographs, as a tool in 24-h recall, for the improvement of dietary assessment among rural populations in developing countries

BACKGROUND: Improvement of traditional methods for dietary assessment is necessary, especially in rural areas where it is more difficult to succeed with self-reporting methods. This study presents and validates a method for improving accuracy when measuring food and nutrient intake of individuals in...

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Autores principales: Lazarte, Claudia E, Encinas, Ma Eugenia, Alegre, Claudia, Granfeldt, Yvonne
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2012
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3547686/
https://www.ncbi.nlm.nih.gov/pubmed/22931128
http://dx.doi.org/10.1186/1475-2891-11-61
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author Lazarte, Claudia E
Encinas, Ma Eugenia
Alegre, Claudia
Granfeldt, Yvonne
author_facet Lazarte, Claudia E
Encinas, Ma Eugenia
Alegre, Claudia
Granfeldt, Yvonne
author_sort Lazarte, Claudia E
collection PubMed
description BACKGROUND: Improvement of traditional methods for dietary assessment is necessary, especially in rural areas where it is more difficult to succeed with self-reporting methods. This study presents and validates a method for improving accuracy when measuring food and nutrient intake of individuals in rural areas. It is called the “Food photography 24-h recall method” (FP 24-hR) and is a modified 24-h recall with the addition of a digital food photography record and a photo atlas. METHODS: The study was carried out in a rural area in the tropical region of Bolivia; 45 women participated. Validation of the method was made by comparing it with a reference method, the Weighed Food Record (WFR). During the FP 24-hR, digital photographs were taken by the subjects of all food consumed during a day and a 24-h recall questionnaire was conducted by an interviewer. An estimate of the amount of food consumed was made using a photo atlas and the photographs taken by the subjects. For validation, comparison was made between the calculations, by both methods, of the levels of food, and nutrient, intake. RESULTS: The comparison was made in 10 food categories; most of which were somewhat underestimated from −2.3% (cassava) to −6.8% (rice), except for beverages (+1.6%) and leafy vegetables (+8.7%), which were overestimated. Spearman’s correlation coefficients were highly significant (r from 0.75 for eggs to 0.98 for potato and cassava). Nutrient intakes calculated with data from both methods showed small differences from -0.90% (vitamin C) to -5.98% (fat). Although all nutrients were somewhat underestimated, Pearson(′)s coefficients are high (>0.93 for all) and statistically significant. Bland Altman analysis showed that differences between both methods were random and did not exhibit any systematic bias over levels of food and nutrient intake, with acceptable 95% limits of agreement. CONCLUSION: The FP 24-hR exhibits acceptable differences when compared with a WFR, digital photos are useful as a memory aid for the subjects during 24-h recall and as an estimation tool. The method is suitable for assessing dietary intake among rural populations in developing countries.
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spelling pubmed-35476862013-01-23 Validation of digital photographs, as a tool in 24-h recall, for the improvement of dietary assessment among rural populations in developing countries Lazarte, Claudia E Encinas, Ma Eugenia Alegre, Claudia Granfeldt, Yvonne Nutr J Research BACKGROUND: Improvement of traditional methods for dietary assessment is necessary, especially in rural areas where it is more difficult to succeed with self-reporting methods. This study presents and validates a method for improving accuracy when measuring food and nutrient intake of individuals in rural areas. It is called the “Food photography 24-h recall method” (FP 24-hR) and is a modified 24-h recall with the addition of a digital food photography record and a photo atlas. METHODS: The study was carried out in a rural area in the tropical region of Bolivia; 45 women participated. Validation of the method was made by comparing it with a reference method, the Weighed Food Record (WFR). During the FP 24-hR, digital photographs were taken by the subjects of all food consumed during a day and a 24-h recall questionnaire was conducted by an interviewer. An estimate of the amount of food consumed was made using a photo atlas and the photographs taken by the subjects. For validation, comparison was made between the calculations, by both methods, of the levels of food, and nutrient, intake. RESULTS: The comparison was made in 10 food categories; most of which were somewhat underestimated from −2.3% (cassava) to −6.8% (rice), except for beverages (+1.6%) and leafy vegetables (+8.7%), which were overestimated. Spearman’s correlation coefficients were highly significant (r from 0.75 for eggs to 0.98 for potato and cassava). Nutrient intakes calculated with data from both methods showed small differences from -0.90% (vitamin C) to -5.98% (fat). Although all nutrients were somewhat underestimated, Pearson(′)s coefficients are high (>0.93 for all) and statistically significant. Bland Altman analysis showed that differences between both methods were random and did not exhibit any systematic bias over levels of food and nutrient intake, with acceptable 95% limits of agreement. CONCLUSION: The FP 24-hR exhibits acceptable differences when compared with a WFR, digital photos are useful as a memory aid for the subjects during 24-h recall and as an estimation tool. The method is suitable for assessing dietary intake among rural populations in developing countries. BioMed Central 2012-08-29 /pmc/articles/PMC3547686/ /pubmed/22931128 http://dx.doi.org/10.1186/1475-2891-11-61 Text en Copyright ©2012 Lazarte et al.; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research
Lazarte, Claudia E
Encinas, Ma Eugenia
Alegre, Claudia
Granfeldt, Yvonne
Validation of digital photographs, as a tool in 24-h recall, for the improvement of dietary assessment among rural populations in developing countries
title Validation of digital photographs, as a tool in 24-h recall, for the improvement of dietary assessment among rural populations in developing countries
title_full Validation of digital photographs, as a tool in 24-h recall, for the improvement of dietary assessment among rural populations in developing countries
title_fullStr Validation of digital photographs, as a tool in 24-h recall, for the improvement of dietary assessment among rural populations in developing countries
title_full_unstemmed Validation of digital photographs, as a tool in 24-h recall, for the improvement of dietary assessment among rural populations in developing countries
title_short Validation of digital photographs, as a tool in 24-h recall, for the improvement of dietary assessment among rural populations in developing countries
title_sort validation of digital photographs, as a tool in 24-h recall, for the improvement of dietary assessment among rural populations in developing countries
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3547686/
https://www.ncbi.nlm.nih.gov/pubmed/22931128
http://dx.doi.org/10.1186/1475-2891-11-61
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