title: Underreporting of habitual food intake is explained by undereating in highly motivated lean women.
abstract: Underreporting of habitual food intake can be explained by underrecording and/or undereating. This study was designed to discriminate between the two errors mentioned, by measuring energy and water balance. Twenty-four lean female dieticians were recruited as subjects. Energy intake and water intake were measured for 1 wk with a weighed dietary record. Energy expenditure was estimated from measurements of resting metabolic rate, and measured physical activity with a triaxial accelerometer for movement registration. Water loss was estimated with deuterium-labeled water. Energy balance was determined by measuring the change in body mass over a nonrecording week (preceding the recording week) and over the recording week. Mean energy and water intake were 8.5 +/- 1.0 MJ/d and 2.3 +/- 0.5 L/d. The change in body mass in the nonrecording week was 0.1 +/- 0.6 kg and in the recording week -0.6 +/- 0.8 kg (paired t test; P = 0.02), indicating 16% undereating. Recorded water intake plus calculated metabolic water closely matched measured water loss (r = 0.93; P = 0.0001), which indicated a high recording precision. In conclusion, in the studied group of highly motivated lean women, there was 16% underreporting of habitual food intake, which could be explained by undereating.
authors: Department of Human Biology, Maastricht University, The Netherlands.
authors: A H
authors: AH
authors: Goris
authors: K R
authors: KR
authors: Westerterp
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D015992:Body Mass Index; D015930:Diet Records; D004034:Diet Surveys; D004326:Drinking; D004435:Eating; D002149:Energy Intake; D004734:Energy Metabolism; D005247:Feeding Behavior; D005260:Female; D006801:Humans; D008875:Middle Aged; D005082:Physical Exertion; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D014867:Water / Q000378:metabolism
chemical_list: D014867:Water