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Energy validity increases with increasing numbers of days of DietDay: a self administered web‐based 24 hour recall
Author(s) -
Arab Lenore,
Jardack Patricia,
Liu Weiqing,
Schoeller Dale
Publication year - 2009
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.23.1_supplement.551.8
Subject(s) - caloric theory , total energy expenditure , zoology , medicine , energy expenditure , doubly labeled water , energy balance , total energy , caloric intake , mean difference , correlation , standard deviation , mathematics , statistics , body weight , biology , psychology , ecology , confidence interval , geometry , displacement (psychology) , psychotherapist
The validity of assessment of caloric intakes using a 24 hour recall depends upon the number of days assessed. Antagonistic dynamics balance the benefit of increasing days to average out intra individual variation in intake against the burden of additional days of recall. The Energetics study was conducted to validate caloric intake using a multipass, food image‐based, computerized tool (DietDay) against total energy expenditure measured by doubly labeled water (DLW). 163 Caucasians and African Americans conducted 8 repeat assessments on independent days. The Pearson's correlation between DLW and the mean of 3 DietDays was 0.34 ; for 7 days was 0.41. The mean total energy difference between methods was minimal, but increased with increasing numbers of days of assessment. Total energy expenditure in this group averaged 2546 (SD 550). This was within 9 kcal/d of the reported mean caloric intakes for two days (2555 SD 1303), 140 kcal of the six days intake average (2406 SD 950) and 209 kcal of the eight day average (2337 SD 866). The correlation increased from .16 to .42 with increasing numbers of days of recall from 1 to 8. As might be expected; increasing numbers of days increased the size of the correlation coefficient but decreased the closeness to the true energy intake. The latter may be indicative of reporting fatigue with increasing numbers of days reported. Supported by NIH R01CA105048.