Validity of 1-, 2-, 3-, and 4-day Dietary Records in Comparison with 7-day Weighed Dietary Records

Abstract

  The purpose of this study was to validate 1-, 2-, 3-, and 4-day dietary records (DRs) by comparing with 7-day weighed dietary records (7-DWDRs). Subjects were 29 university students and 6 graduate students. The order of procedure was as follows : first, the subjects kept 7-DWDRs in which Saturday and Sunday were included ; second, approximately 2 weeks after 7-DWDRs, the subjects kept 4-day DRs without weighing from Sunday to Wednesday. Many of food stuff intakes and nutrient intakes assessed with 2-, 3-, and 4-day DRs moderately to highly correlated with the respective intakes assessed with 7-DWDRs. Less food stuff intakes and nutrient intakes assessed with 1-day DRs correlated with the respective intakes assessed with 7-DWDRs. The results of the present study suggest that minimal days necessary for estimating nutrient consumption are at least 2 days.