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Validation with biological markers for food intake of a dietary assessment method used by Swedish women with three different with dietary preferences

Published online by Cambridge University Press:  01 September 1998

Gunnar Johansson ,
Agneta Åkesson ,
Marika Berglund ,
Barbro Nermell  and
Marie Vahter
Gunnar Johansson
Affiliation:
Institute of Environmental Medicine, Karolinska Institutet, Box 210, S-171 77 Stockholm, Sweden
Agneta Åkesson
Affiliation:
Institute of Environmental Medicine, Karolinska Institutet, Box 210, S-171 77 Stockholm, Sweden
Marika Berglund
Affiliation:
Institute of Environmental Medicine, Karolinska Institutet, Box 210, S-171 77 Stockholm, Sweden
Barbro Nermell
Affiliation:
Institute of Environmental Medicine, Karolinska Institutet, Box 210, S-171 77 Stockholm, Sweden
Marie Vahter*
Affiliation:
Institute of Environmental Medicine, Karolinska Institutet, Box 210, S-171 77 Stockholm, Sweden
*
*Corresponding author: E-mail [email protected]
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Abstract

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Objectives:

To validate a dietary assessment method, a 4-day food record together with a duplicate portion technique, with biological markers for food intake.

Design:

Four days of duplicate portions were collected in parallel with food recording. A 24-h urine sample and the faeces corresponding to the food intake (using a coloured marker) were collected. Completeness of urine and faeces collections was assessed using para-aminobenzoic acid (PABA) in urine and cadmium in faeces, respectively. Biomarkers of food intake (energy, protein, fibre, sodium, potassium, calcium) were measured in urine and faeces.

Setting:

Swedish west coast.

Subjects:

Non-smoking Swedish women, 20–50 years of age, consuming a mixed diet (n=34), a mixed diet rich in shellfish (n=17) or a vegetarian/high-fibre diet (n=23).

Results:

The average ratio (food intake according to the dietary assessment methods/biological marker) for protein, sodium, potassium and calcium was 0.86. This indicates an underestimation of the food intake by approximately 15%. The ratio of stated fibre intake to biological marker was 1.20 for the mixed diet and the vegetarian diet group, indicating an overestimation by approximately 20%.

Conclusions:

The underestimation of the intake of protein, sodium, potassium and calcium by all three groups and the overestimation of the fibre intake by two groups indicate that underreporting is selective to certain nutrients and foods and to various groups of people. The two dependent dietary assessment methods were equally good in measuring protein intake, which indicates that the women recorded what they actually duplicated.

Keywords

ValidationDietary assessmentFood recordDuplicate dietBiomarkers of food intake
Type
Research Article
Information
Public Health Nutrition , Volume 1 , Issue 3 , September 1998 , pp. 199 - 206
Copyright
Copyright © The Nutrition Society 1998

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