Comparison of dietary fat and fatty acid intake estimated by the duplicate diet collection technique and estimated dietary records
Brady, L.M., Lesauvage, S.V.M., Saini, N., Williams, C.M. and Lovegrove, J.A. (2003) Comparison of dietary fat and fatty acid intake estimated by the duplicate diet collection technique and estimated dietary records. Journal of Human Nutrition and Dietetics, 16 (6). pp. 393-401. ISSN 0952-3871
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To link to this article DOI: 10.1046/j.1365-277X.2003.00475.x
Introduction A high saturated fatty acid intake is a well recognized risk factor for coronary heart disease development. More recently a high intake of n-6 polyunsaturated fatty acids (PUFA) in combination with a low intake of the long chain n-3 PUFA, eicosapentaenoic acid and docosahexaenoic acid has also been implicated as an important risk factor. Aim To compare total dietary fat and fatty acid intake measured by chemical analysis of duplicate diets with nutritional database analysis of estimated dietary records, collected over the same 3-day study period. Methods Total fat was analysed using soxhlet extraction and subsequently the individual fatty acid content of the diet was determined by gas chromatography. Estimated dietary records were analysed using a nutrient database which was supplemented with a selection of dishes commonly consumed by study participants. Results Bland & Altman statistical analysis demonstrated a lack of agreement between the two dietary assessment techniques for determining dietary fat and fatty acid intake. Conclusion The lack of agreement observed between dietary evaluation techniques may be attributed to inadequacies in either or both assessment techniques. This study highlights the difficulties that may be encountered when attempting to accurately evaluate dietary fat intake among the population.