Abstract
The main dietary sources of trans fatty acids are partially hydrogenated vegetable oils (PHVO), and products derived from polyunsaturated fatty acid biohydrogenation (PUFA-BHP) in ruminants. Trans fatty acid intake has historically been associated with negative effects on health, generating an anti-trans fat campaign to reduce their consumption. The profiles and effects on health of PHVO and PUFA-BHP can, however, be quite different. Dairy products naturally enriched with vaccenic and rumenic acids have many purported health benefits, but the putative benefits of beef fat naturally enriched with PUFA-BHP have not been investigated. The objective of the present experiment was to determine the effects of beef peri-renal fat (PRF) with differing enrichments of PUFA-BHP on lipid and insulin metabolism in a rodent model of dyslipidemia and insulin resistance (JCR:LA-cp rat). The results showed that 6 weeks of diet supplementation with beef PRF naturally enriched due to flaxseed (FS-PRF) or sunflower-seed (SS-PRF) feeding to cattle significantly improved plasma fasting insulin levels and insulin sensitivity, postprandial insulin levels (only in the FS-PRF) without altering dyslipidemia. Moreover, FS-PRF but not SS-PRF attenuated adipose tissue accumulation. Therefore, enhancing levels of PUFA-BHP in beef PRF with FS feeding may be a useful approach to maximize the health-conferring value of beef-derived fats.
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Abbreviations
- ALA:
-
α-Linolenic acid
- ANOVA:
-
Analysis of variance
- AD:
-
Atypical dienes
- BCFA:
-
Branched-chin fatty acids
- BHP:
-
Biohydrogenation products
- c :
-
cis
- CLA:
-
Conjugated linoleic acids
- CLNA:
-
Conjugated linolenic acids
- DM:
-
Dry matter
- FA:
-
Fatty acids
- FAME:
-
Fatty acid methyl esters
- GC:
-
Gas chromatography
- FS:
-
Flaxseed
- GH:
-
Grass hay
- LNA:
-
Linoleic acid
- n-3:
-
Omega-3
- n-6:
-
Omega-6
- PRF:
-
Peri-renal fat
- PUFA:
-
Polyunsaturated fatty acids
- RC:
-
Red clover silage
- SCF:
-
Subcutaneous fat
- SS:
-
Sunflower-seed
- SFA:
-
Saturated fatty acids
- t :
-
Trans
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Acknowledgments
Funding for this work was provided by Alberta Livestock and Meat Agency (ALMA) (to M.E.R.D) as well as an NSERC Discovery Grant (to S.D.P). Dr. C. Mapiye received an NSERC Fellowship funded through ALMA, and Dr. P. Vahmani received an NSERC Fellowship funded by the Agriculture and Agri-Food Canada Peer Review Program.
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Diane, A., Borthwick, F., Mapiye, C. et al. Beef Fat Enriched with Polyunsaturated Fatty Acid Biohydrogenation Products Improves Insulin Sensitivity Without Altering Dyslipidemia in Insulin Resistant JCR:LA-cp Rats. Lipids 51, 821–831 (2016). https://doi.org/10.1007/s11745-016-4148-7
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DOI: https://doi.org/10.1007/s11745-016-4148-7