The effect of casein, hydrolyzed casein, and whey proteins on urinary and postprandial plasma metabolites in overweight and moderately obese human subjects

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DOI

    Mette Schmedes, Line Q Bendtsen, Department of Nutrition, Exercise and Sports, University of Copenhagen, DanmarkSisse Gomes, Department of Nutrition, Exercise and Sports, University of Copenhagen, DanmarkBjørn Liaset, Department of Seafood in Model Systems, Institute of Marine Research, Bergen, Norway., NorgeJens J Holst, Department of Biomedical Sciences and The NNF Center for Basic Metabolic Research, University of Copenhagen, Copenhagen, Denmark., Christian Ritz, Department of Nutrition, Exercise and Sports, University of Copenhagen, DanmarkSøren Reitelseder, Department of Biomedical Sciences, Institute of Sports Medicine, Bispebjerg Hospital, Copenhagen, Denmark., Anders Sjödin, a Department of Nutrition, Exercise and Sports , University of Copenhagen , Copenhagen , Denmark., Arne Astrup, a Department of Nutrition, Exercise and Sports , University of Copenhagen , Copenhagen , Denmark.,
  • Jette F Young
  • Ulrik K Sundekilde
  • Hanne C Bertram

BACKGROUND: Casein and whey proteins differ in amino acid composition and absorption rate; however, the absorption rate of casein can be increased to mimic that of whey proteins by exogenous hydrolysis. In view of these compositional differences, we studied the metabolic responses to intake of casein, hydrolyzed casein, and whey proteins in overweight and moderately obese men and women by investigating select urinary and blood plasma metabolites.

RESULTS: A total of 21 urinary and 23 plasma metabolites were identified by nuclear magnetic resonance spectroscopy. The postprandial plasma metabolites revealed a significant diet-time interaction for isoleucine (P = 0.001) and tyrosine (P = 0.001). The level of isoleucine and tyrosine peaked 90 min postprandially with a 1.4-fold difference following intake of whey proteins compared with either casein or hydrolyzed casein. A 1.2-fold higher urinary level of lactate was observed after intake of whey proteins compared with intake of intact casein (P < 0.01).

CONCLUSION: The plasma metabolites revealed different amino acid profiles reflecting the amino acid composition of casein and whey proteins. Furthermore, the results support that casein hydrolysates neither affect the postprandial amino acid absorption rate nor the amino acid level compared with that of intact casein. The urinary lactate increases following whey protein intake might indicate a higher metabolism of glucogenic amino acids. © 2018 Society of Chemical Industry.

OriginalsprogEngelsk
TidsskriftJournal of the Science of Food and Agriculture
Vol/bind98
Tidsskriftsnummer15
Sider (fra-til)5598-5605
Antal sider8
ISSN1097-0010
DOI
StatusUdgivet - dec. 2018

Bibliografisk note

© 2018 Society of Chemical Industry.

    Forskningsområder

  • dairy proteins, ABSORPTION KINETICS, metabolomics, postprandial metabolism

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