DIETARY UNDERREPORTING - VALIDITY OF DIETARY MEASUREMENTS OF ENERGY-INTAKE USING A 7-DAY DIETARY RECORD AND A DIET HISTORY IN NONOBESE SUBJECTS

Substantial dietary underreporting questions the validity of dietary m easurements of energy intake (EI). The present study compares the valu e of a 7-day prospective dietary record (7dDR) with a computer program -based diet history (DH). 7dDR and DH were performed in 50 non-obese s ubjects (33 females, 17 males, mean age 26.1 years, BMI 18.9-29.6 kg/m (2)) using total energy expenditure (EE = sum of resting metabolic rat e as measured by indirect calorimetry plus energy expenditure derived from an activity protocol) as standard for the validity of data on EI. EI was 2,206 (728-3,646) kcal/day for 7dDR and 2,398 (566-4,764) kcal /day for DH. There was an association between EI for 7dDR and EI for D H (r = 0.6, p < 0.0001). Underreporting [i.e. a difference between EI and EE (Delta E = EI-EE)] of 20% or more was seen in 48% (7dDR, mean - 1,047 kcal/day, range -616 to -1,895, or -38.8% of EE) or 48 % (DH, - 1,151 kcal/day, -594 to -2,057 kcal/day, or -42.3% of EE). Considerabl e differences were found between Delta E for 7dDR and Delta E for DH ( mean 603, range 26-2,033 kcal/day), and only 34% of underreporting sub jects were identified by both dietary measurements. It is concluded th at at the individual level dietary underreporting is influenced by the dietary assessment tool.