Journal article
Protein calculation from food diaries of adult humans underestimates values determined using a biological marker
The Journal of nutrition, Vol.125(9), pp.2333-2340
09/1995
DOI: 10.1093/jn/125.9.2333
PMID: 7666250
Abstract
We evaluated the ability of a biological marker (nitrogen excretion expressed as protein) to accurately reflect the protein intake of 12 healthy subjects consuming a low protein diet (0.6 g protein/kg standard body wt). In this crossover study, protein intake was confirmed by chemically analyzing a duplicate of the constant diet each subject consumed for 3 d and by calculating protein content of self-selected diets recorded during two additional 3-d periods. Diet analysis matched excretion (difference 0.03 +/- 0.04 g protein/kg standard body wt, means +/- SEM). Self-selected intake manually calculated by subjects using educational materials matched the prescription [0.60 (0.42, 0.86) g protein/kg standard body wt, median (range)], but underestimated excretion by 0.18 +/- 0.02 g protein/kg standard body wt (means +/- SEM). Self-selected intake recalculated by the authors using a computerized database was only +0.05 (-0.08, +0.44) g protein/kg standard body wt higher than subjects' calculations, suggesting that discrepancies between databases and/or subject calculation errors only partially accounted for how greatly self-selected intake underestimated excretion. In a secondary analysis of self-selected intake, the three dietitian subjects consumed more energy and excreted less protein than nondietitians (137 +/- 4.9 vs. 94 +/- 3.5 kJ/standard body wt; 0.72 +/- 0.02 vs. 0.83 +/- 0.02 g protein/kg standard body wt), suggesting that adequate energy intake and/or additional training might improve agreement between intake and excretion. Thus, discrepancies between protein excretion and reported intake may reflect factors other than willful noncompliance.
Details
- Title: Subtitle
- Protein calculation from food diaries of adult humans underestimates values determined using a biological marker
- Creators
- Linda G Snetselaar - Department of Nephrology, College of Medicine, University of Iowa, Iowa City 52242, USACatherine A ChenardLawrence G HunsickerPhyllis J Stumbo
- Resource Type
- Journal article
- Publication Details
- The Journal of nutrition, Vol.125(9), pp.2333-2340
- Publisher
- United States
- DOI
- 10.1093/jn/125.9.2333
- PMID
- 7666250
- ISSN
- 0022-3166
- eISSN
- 1541-6100
- Grant note
- RR0059 / NCRR NIH HHS
- Language
- English
- Date published
- 09/1995
- Academic Unit
- Epidemiology; Fraternal Order of Eagles Diabetes Research Center; Nephrology; Internal Medicine
- Record Identifier
- 9983996071102771
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