Document Detail

Use of biological markers to validate self-reported dietary intake in a random sample of the European Prospective Investigation into Cancer United Kingdom Norfolk cohort.
MedLine Citation:
PMID:  11470719     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: The validity of dietary assessment methods should be established before diet-disease associations are reported. OBJECTIVE: Our objective was to validate a 7-d food diary and a food-frequency questionnaire (FFQ) against independent biomarkers of intake in urine (nitrogen, potassium, and sodium) and blood (plasma ascorbic acid). DESIGN: A total of 146 healthy middle-aged men and women were recruited from the European Prospective Investigation into Cancer UK Norfolk cohort, a free-living cohort of approximately 25000 persons. Over a 9-mo period, urinary nitrogen, potassium, and sodium were estimated from 2-6 complete 24-h urine collections in 134 subjects and plasma ascorbic acid was estimated from 2-3 fasting blood samples in 118 subjects. Subjects completed 2 FFQs and two 7-d food diaries. RESULTS: In men and women combined, correlations between 24-h urinary nitrogen excretion and dietary intake from the 7-d food diary were high (r = 0.57-0.67) compared with those for the FFQ (r = 0.21-0.29). Similarly, correlations between urinary potassium and dietary potassium were higher for the 7-d food diary (r = 0.51-0.55) than for the FFQ (r = 0.32-0.34). There was no overall difference in correlations between plasma ascorbic acid and dietary vitamin C between the 7-d food diary (r = 0.40-0.52) and the FFQ (r = 0.44-0.45). CONCLUSIONS: These data indicate that, despite increased subject burden, the 7-d food diary provided a better estimate of nitrogen and potassium intakes than did the FFQ in this study population. However, with respect to plasma ascorbic acid, both the FFQ and 7-d food diary provided a similar ranking of subjects according to vitamin C intake.
N M McKeown; N E Day; A A Welch; S A Runswick; R N Luben; A A Mulligan; A McTaggart; S A Bingham
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Publication Detail:
Type:  Comparative Study; Journal Article; Multicenter Study; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Validation Studies    
Journal Detail:
Title:  The American journal of clinical nutrition     Volume:  74     ISSN:  0002-9165     ISO Abbreviation:  Am. J. Clin. Nutr.     Publication Date:  2001 Aug 
Date Detail:
Created Date:  2001-07-25     Completed Date:  2001-08-23     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0376027     Medline TA:  Am J Clin Nutr     Country:  United States    
Other Details:
Languages:  eng     Pagination:  188-96     Citation Subset:  AIM; IM    
Medical Research Council, Dunn Human Nutrition Unit, Cambridge, United Kingdom.
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MeSH Terms
Biological Markers / blood,  urine
Cohort Studies
Diet Records
Diet Surveys
Energy Intake
Folic Acid / blood*
Middle Aged
Nitrogen / urine*
Nutrition Assessment
Potassium / urine*
Prospective Studies
Reproducibility of Results
Self Disclosure
Sodium / urine*
Reg. No./Substance:
0/Biological Markers; 59-30-3/Folic Acid; 7440-09-7/Potassium; 7440-23-5/Sodium; 7727-37-9/Nitrogen

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