Nutrients 2012, 4(2), 112-131; doi:10.3390/nu4020112
Article

Assessment of the Effect of High or Low Protein Diet on the Human Urine Metabolome as Measured by NMR

1 Department of Human Nutrition, Faculty of Life Sciences, University of Copenhagen, DK-1958 Frederiksberg, Denmark 2 Foss Analytical A/S, DK-3400 Hillerød, Denmark 3 Quality and Technology, Department of Food Science, Faculty of Life Sciences, University of Copenhagen, DK-1958 Frederiksberg, Denmark These authors contributed equally to this work.
* Author to whom correspondence should be addressed.
Received: 30 January 2012; in revised form: 11 February 2012 / Accepted: 13 February 2012 / Published: 20 February 2012
(This article belongs to the Special Issue Foodomics 2011)
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Abstract: The objective of this study was to identify urinary metabolite profiles that discriminate between high and low intake of dietary protein during a dietary intervention. Seventy-seven overweight, non-diabetic subjects followed an 8-week low-calorie diet (LCD) and were then randomly assigned to a high (HP) or low (LP) protein diet for 6 months. Twenty-four hours urine samples were collected at baseline (prior to the 8-week LCD) and after dietary intervention; at months 1, 3 and 6, respectively. Metabolite profiling was performed by 1H NMR and chemometrics. Using partial least squares regression (PLS), it was possible to develop excellent prediction models for urinary nitrogen (root mean square error of cross validation (RMSECV) = 1.63 mmol/L; r = 0.89) and urinary creatinine (RMSECV = 0.66 mmol/L; r = 0.98). The obtained high correlations firmly establish the validity of the metabolomic approach since urinary nitrogen is a well established biomarker for daily protein consumption. The models showed that trimethylamine-N-oxide (TMAO) is correlated to urinary nitrogen. Furthermore, urinary creatine was found to be increased by the HP diet whereas citric acid was increased by the LP diet. Despite large variations in individual dietary intake, differentiated metabolite profiles were observed at the dietary group-level.
Keywords: metabolomics; metabolite profiles; dietary intervention; dietary protein; NMR spectroscopy; chemometrics

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MDPI and ACS Style

Rasmussen, L.G.; Winning, H.; Savorani, F.; Toft, H.; Larsen, T.M.; Dragsted, L.O.; Astrup, A.; Engelsen, S.B. Assessment of the Effect of High or Low Protein Diet on the Human Urine Metabolome as Measured by NMR. Nutrients 2012, 4, 112-131.

AMA Style

Rasmussen LG, Winning H, Savorani F, Toft H, Larsen TM, Dragsted LO, Astrup A, Engelsen SB. Assessment of the Effect of High or Low Protein Diet on the Human Urine Metabolome as Measured by NMR. Nutrients. 2012; 4(2):112-131.

Chicago/Turabian Style

Rasmussen, Lone G.; Winning, Hanne; Savorani, Francesco; Toft, Henrik; Larsen, Thomas M.; Dragsted, Lars O.; Astrup, Arne; Engelsen, Søren B. 2012. "Assessment of the Effect of High or Low Protein Diet on the Human Urine Metabolome as Measured by NMR." Nutrients 4, no. 2: 112-131.

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