Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    Evaluation of food and nutrient intake assessment using concentration biomarkers in European adolescents from the Healthy Lifestyle in Europe by Nutrition in Adolescence study
    Vandevijvere, S. ; Geelen, A. ; Gonzalez-Gross, M. ; Veer, P. van 't; Dallongeville, J. ; Mouratidu, T. ; Dekkers, A. ; Börnhorst, C. ; Breidenassel, C. - \ 2013
    The British journal of nutrition 109 (2013)4. - ISSN 0007-1145 - p. 736 - 747.
    serum cholesteryl esters - n-3 fatty-acids - dietary-intake - energy-intake - additional measurements - micronutrient intake - biochemical markers - adipose-tissue - vitamin-c - validation
    Accurate food and nutrient intake assessment is essential for investigating diet–disease relationships. In the present study, food and nutrient intake assessment among European adolescents using 24 h recalls (mean of two recalls) and a FFQ (separately and the combination of both) were evaluated using concentration biomarkers. Biomarkers included were vitamin C, ß-carotene, DHA+EPA, vitamin B12 (cobalamin and holo-transcobalamin) and folate (erythrocyte folate and plasma folate). For the evaluation of the food intake assessment 390 adolescents were included, while 697 were included for the nutrient intake assessment evaluation. Spearman rank and Pearson correlations, and validity coefficients, which are correlations between intake estimated and habitual true intake, were calculated. Correlations were higher between frequency of food consumption (from the FFQ) and concentration biomarkers than between mean food intake (from the recalls) and concentration biomarkers, especially for DHA+EPA (r 0·35 v. r 0·27). Most correlations were higher among girls than boys. For boys, the highest validity coefficients were found for frequency of fruit consumption (0·88) and for DHA+EPA biomarker (0·71). In girls, the highest validity coefficients were found for fruit consumption frequency (0·76), vegetable consumption frequency (0·74), mean fruit intake (0·90) and DHA+EPA biomarker (0·69). After exclusion of underreporters, correlations slightly improved. Correlations between usual food intakes, adjusted for food consumption frequency, and concentration biomarkers were higher than correlations between mean food intakes and concentration biomarkers. In conclusion, two non-consecutive 24 h recalls in combination with a FFQ seem to be appropriate to rank subjects according to their usual food intake
    Dietary intake and biological measurement of folate: A qualitative review of validation studies
    Park, Y.H. ; Vollset, S.E. ; Boonstra, A. ; Chajes, V. ; Ueland, P.M. ; Slimani, N. - \ 2013
    Molecular Nutrition & Food Research 57 (2013)4. - ISSN 1613-4125 - p. 562 - 581.
    food-frequency questionnaire - neural-tube defects - plasma homocysteine concentrations - whole-blood folate - folic-acid - micronutrient intake - additional measurements - degradation-products - biochemical markers - statistical-methods
    Folate is a nutrient of major health significance, but its dietary intake assessment is particularly complex to quantify through traditional approaches. Attempts have been made to validate dietary instruments for assessing folate intake against circulating concentration biomarkers. However, this requires careful attention on various methodological issues. We conducted a qualitative review of 17 recently published validation studies to identify these issues. The majority of the tested instruments were self-administered food frequency questionnaires while the biomarker most frequently used was serum/plasma folate. Seasonality was not considered in most studies. Little attention was given to using updated food composition databases based on reliable chemical methods and including fortified foods and dietary supplements. Time sequence of the test instrument and the reference biomarker used was often ambiguous, and reference periods did not always match. Correlation coefficient was the metric most commonly used, and correlations between dietary folate intake and blood folate concentration varied from weak to moderate (r = 0.05–0.54). The correlations were stronger when dietary supplement use was considered, and when serum/plasma rather than red blood cell folate was used. This review summarises issues that need to be considered in future studies intending to validate instruments for dietary folate assessment against concentration biomarkers.
    Validation of the assessment of folate and vitamin B12 intake in women of reproductive age: the method of triads
    Verkleij-Hagoort, A.C. ; Vries, J.H.M. de; Stegers, M.P.G. ; Lindemans, J. ; Ursem, N.T.C. ; Steegers-Theunissen, R.P.M. - \ 2007
    European Journal of Clinical Nutrition 61 (2007). - ISSN 0954-3007 - p. 610 - 615.
    food-frequency questionnaire - additional measurements - fundamental principles - micronutrient intake - biochemical markers - energy physiology - validity - supplement - risk - men
    Objective: To validate the folate and vitamin B12 intakes estimated by a food-frequency questionnaire (FFQ) designed to be used in a case-control study on the association between maternal dietary intake and the risk of having a child with a congenital heart defect. Design and subjects: The FFQ was filled out by 53 women of reproductive age. Immediately thereafter, blood samples were taken to determine serum folate, red blood cell (RBC) folate and serum vitamin B12 concentrations. Subsequently, three dietary 24-h recalls (24HR) were completed during a period of three successive weeks and used as a reference method. The recalls comprised two weekdays and one weekend day. Using the method of triads, validity coefficients were calculated by comparing nutrient intakes derived from the FFQ and 24HR with the corresponding nutritional biomarkers in blood. The validity coefficient is the correlation between the dietary intake reported by the FFQ and the unknown 'true' dietary intake. Results: The comparison of B-vitamin intakes reported by the FFQ and the mean of the 24HR revealed deattenuated correlation coefficients of 0.98 for folate and 0.66 for vitamin B12. The correlation coefficients between the B-vitamin intakes estimated by the FFQ and concentrations of serum folate, RBC folate and serum vitamin B12 were 0.20, 0.28 and 0.21, respectively. The validity coefficients for serum folate, RBC folate and serum vitamin B12 were 0.94, 0.75 and 1.00, respectively. The estimated folate and vitamin B12 intakes were comparable with the results of the most recent Dutch food consumption survey. Conclusions: The adapted FFQ is a reliable tool to estimate the dietary intake of energy, macronutrients, folate and vitamin B12 in women of reproductive age. Therefore, this FFQ is suitable for the investigation of nutrient-disease associations in future
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