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Plant- and marine-derived n-3 polyunsaturated fatty acids have differential effects on fasting and postprandial blood lipid concentrations and on the susceptibility of LDL to oxidative modification in moderately hyperlipidemic subjects
- Source :
- American Journal of Clinical Nutrition. April, 2003, Vol. 77 Issue 4, p783, 13 p.
- Publication Year :
- 2003
-
Abstract
- Background: Dietary [alpha]-linolenic acid (ALA) can be converted to long-chain n-3 polyunsaturated fatty acids (PUFAs) in humans and may reproduce some of the beneficial effects of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) on cardiovascular disease risk factors. Objective: This study aimed to compare the effects of increased dietary intakes of ALA and EPA+DHA on a range of atherogenic risk factors. Design: This was a placebo-controlled, parallel study involving 150 moderately hyperlipidemic subjects randomly assigned to 1 of 5 interventions: 0.8 or 1.7 g EPA+DHA/d, 4.5 or 9.5 g ALA/d, or an n-6 PUFA control for 6 mo. Fatty acids were incorporated into 25 g of fat spread and 3 capsules to be consumed daily. Results: The change in fasting or postprandial lipid, glucose, or insulin concentrations or in blood pressure was not significantly different after any of the n-3 PUFA interventions compared with the n-6 PUFA control. The mean ([+ or -] SEM) change in fasting triacylglycerols after the 1.7-g/d EPA+DHA intervention (-7.7 [+ or-] 4.99%) was significantly (P < 0.05) different from the change after the 9.5-g/d ALA intervention (10.9 [+ or -] 4.5%). The ex vivo susceptibility of LDL to oxidation was higher after the 1.7-g/d EPA+DHA intervention than after the control and ALA interventions (P < 0.05). There was no significant change in plasma [alpha]-tocopherol concentrations or in whole plasma antioxidant status in any of the groups. Conclusion: At estimated biologically equivalent intakes, dietary ALA and EPA+DHA have different physiologic effects. KEY WORDS [alpha]-Linolenic acid, eicosapentaenoic acid, docosahexaenoic acid, polyunsaturated fatty acids, n-3 fatty acids, lipids, plasma fatty acid, LDL oxidation, moderately hyperlipidemic subjects, triacylglycerol
Details
- ISSN :
- 00029165
- Volume :
- 77
- Issue :
- 4
- Database :
- Gale General OneFile
- Journal :
- American Journal of Clinical Nutrition
- Publication Type :
- Periodical
- Accession number :
- edsgcl.100109457