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Title:   Author  item
                                            AARON, GRANT - University Of Californiaitem
                                            Keim, Nancyitem
                                            DREWNOWSKI, ADAM - University Of Washingtonitem
                                            TOWNSEND, MARILYN - University Of California Agriculture And Natural Resources (UCANR)
  Submitted to: The American Journal of Clinical Nutrition
                                    Publication Type: Peer Reviewed Journal
                                    Publication Acceptance Date: 12/10/2012
                                    Publication  Date: 2/6/2013
                                    Citation: Aaron, G., Keim, N.L., Drewnowski, A., Townsend, M. 2013. Estimating dietary costs of low-income women in California: A comparison of two approaches. American Journal of Clinical Nutrition. 97(4):835:841.Interpretive Summary: To better understand diet costs at the individual level new, stream-lined approaches are needed.  By linking food costs of individual food items to a food frequency questionnaire, an estimate of typical daily diet cost can be estimated.  This approach was compared to a more time-intensive method of obtaining multiple 24-hour dietary recalls and associated receipts from grocery stores.  The diet costs in $ spent per day or $ spent per calorie intake did not differ between the less intensive and more intensive method. Although the agreement between methods was weaker than expected, the less time-intensive method shows promise but needs further refinement to improve accuracy.
                                Technical Abstract: Objective:  Compare two approaches for estimating individual daily diet costs in a population of low-income women in California. Design: Cost estimates based on time-intensive Method 1 (three 24-h recalls and associated food prices on receipts) were compared with estimates using a lesser intensive Method 2 (a food frequency questionnaire and store prices). Subjects:  SNAP-Ed and EFNEP participants (n=121) were recruited. Main outcome measures: mean daily diet costs, both unadjusted and adjusted for energy, were compared using Pearson correlation coefficients and the Bland-Altman 95% limits of agreement between methods. Results:  Energy and nutrient intakes derived by the two methods were comparable; where differences occurred, the FFQ (Method 2) provided higher nutrient values than did the 24-h recalls (Method 1).  Crude daily diet cost was $6.32 by the 24-h recall method and $5.93 by the FFQ method (P = 0.221).  Energy adjusted diet cost was $6.65 by the 24-h recall method and $5.98 by the FFQ method (P <0.001). Conclusions Although the agreement between methods was weaker than expected, both approaches may be useful.  Additional research is needed to further refine a large national survey approach to estimate daily dietary costs using a minimal time-intensive method.


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