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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

Lazarte, Claudia LU ; Encinas, Ma Eugenia; Alegre, Claudia and Granfeldt, Yvonne LU (2012) In Nutrition Journal 11.
Abstract
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... (More)
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 [MINUS SIGN]2.3% (cassava) to [MINUS SIGN]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[ACUTE ACCENT]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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nutrition Journal
volume
11
publisher
BioMed Central
external identifiers
  • wos:000314520000001
  • scopus:84865420032
ISSN
1475-2891
DOI
10.1186/1475-2891-11-61
language
English
LU publication?
yes
id
0450325a-e8ae-4127-ae58-0c11b62ab215 (old id 3053935)
date added to LUP
2012-09-18 16:07:13
date last changed
2017-07-30 04:16:27
@article{0450325a-e8ae-4127-ae58-0c11b62ab215,
  abstract     = {Background<br/><br>
 <br/><br>
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.<br/><br>
 <br/><br>
Methods<br/><br>
 <br/><br>
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.<br/><br>
 <br/><br>
Results<br/><br>
 <br/><br>
The comparison was made in 10 food categories; most of which were somewhat underestimated from [MINUS SIGN]2.3% (cassava) to [MINUS SIGN]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[ACUTE ACCENT]s coefficients are high (&gt;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.<br/><br>
 <br/><br>
Conclusion<br/><br>
 <br/><br>
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.},
  articleno    = {61},
  author       = {Lazarte, Claudia and Encinas, Ma Eugenia and Alegre, Claudia and Granfeldt, Yvonne},
  issn         = {1475-2891},
  language     = {eng},
  publisher    = {BioMed Central},
  series       = {Nutrition Journal},
  title        = {Validation of digital photographs, as a tool in 24-h recall, for the improvement of dietary assessment among rural populations in developing countries},
  url          = {http://dx.doi.org/10.1186/1475-2891-11-61},
  volume       = {11},
  year         = {2012},
}