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Eur J Nutr. 2019 Apr 10. doi: 10.1007/s00394-019-01963-0. [Epub ahead of print]

Effects of low doses of fish and milk proteins on glucose regulation and markers of insulin sensitivity in overweight adults: a randomised, double blind study.

Author information

1
Dietary Protein Research Group, Department of Clinical Medicine, University of Bergen, 5020, Bergen, Norway.
2
Department of Chemistry, University of Bergen, PO Box 7803, 5020, Bergen, Norway.
3
Nofima BioLab, Oasen, PO Box 1425, 5828, Bergen, Norway.
4
Broegelmann Research Laboratory, Department of Clinical Science, University of Bergen, Bergen, Norway.
5
Bevital AS, Jonas Lies veg 87, 5021, Bergen, Norway.
6
Department of Clinical Science, University of Bergen, 5021, Bergen, Norway.
7
Laboratory of Clinical Biochemistry, Haukeland University Hospital, 5021, Bergen, Norway.
8
SINTEF Ocean, Brattørkaia 17 C, 7010, Trondheim, Norway.
9
Hormone Laboratory, Haukeland University Hospital, Bergen, 5021, Bergen, Norway.
10
Nutrimar AS, Industrivei 23, 7266, Kverva, Norway.
11
Blue Protein, 5393, Storebø, Norway.
12
Dietary Protein Research Group, Department of Clinical Medicine, University of Bergen, 5020, Bergen, Norway. oddrun.gudbrandsen@k1.uib.no.
13
Department of Clinical Medicine, University of Bergen, Haukeland University Hospital, 5021, Bergen, Norway. oddrun.gudbrandsen@k1.uib.no.

Abstract

PURPOSE:

To examine whether supplementation with low doses of fish or milk proteins would affect glucose regulation and circulating lipid concentrations in overweight healthy adults.

METHODS:

Ninety-three overweight adults were assigned to receive 2.5 g protein/day from herring (HER), salmon (SAL), cod (COD) or milk (CAS, a casein-whey mixture as positive control) as tablets for 8 weeks.

RESULTS:

Seventy-seven participants were included in the analyses. HER and SAL did not affect glucose and insulin concentrations. COD significantly reduced within-group changes in 90 and 120 min postprandial glucose concentrations but changes were not different from HER and SAL groups. CAS supplementation significantly reduced the area under the curve for glucose concentrations (- 7%), especially when compared to SAL group, and reduced postprandial insulin c-peptide concentration (- 23%). Reductions in acetoacetate (- 24%) and β-hydroxybutyrate (- 29%) serum concentrations in HER group were more prominent compared to SAL and COD groups, with no differences between fish protein groups for α-hydroxybutyrate. Serum concentrations of α-hydroxybutyrate (- 23%), acetoacetate (- 39%) and β-hydroxybutyrate (- 40%) were significantly reduced within CAS group, and the decreases were significantly more pronounced when compared to SAL group. Serum lipid concentrations were not altered in any of the intervention groups.

CONCLUSION:

Findings indicate that 2.5 g/day of proteins from fish or milk may be sufficient to improve glucose regulation in overweight adults. The effects were most pronounced after supplementation with proteins from cod, herring and milk, whereas salmon protein did not affect any of the measurements related to glucose regulation.

CLINICAL TRAIL REGISTRATION:

This trial was registered at clinicaltrials.gov as NCT01641055.

KEYWORDS:

Cod protein; Fish protein; Glucose; Herring protein hydrolysate; Milk protein; Salmon protein hydrolysate

PMID:
30972484
DOI:
10.1007/s00394-019-01963-0

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