This study compares the effects of two lipid-lowering diets [a diet enriched in MUFAs (monounsaturated fatty acids) and a HCLF (high-carbohydrate/low-fat) diet] with a controlled carotenoid content on risk factors for coronary heart disease, including in vitro copper-induced LDL (low-density lipoprotein) oxidation and serum lipid levels. A randomized crossover dietary intervention study, with two diets each consumed for 14–16 days, was conducted in 18 women and 13 men aged 20–70 years, recruited via personal contacts and advertisements in newspapers. Both diets (MUFA-enriched diet and HCLF diet) contained the same basic foods and had a controlled carotenoid content, high in lycopene. The in vitro copper-induced oxidation of isolated LDL showed a longer lag phase (mean difference 7.4 min in women and 7.34 min in men) after the MUFA-enriched diet compared with the HCLF diet. Serum total cholesterol, LDL cholesterol and carotenoid levels were similar after the two diets. Serum triacylglycerol levels were significantly lower and those of HDL (high-density lipoprotein) cholesterol were significantly higher at the end of the MUFA-enriched diet compared with the HCLF diet. It is concluded that the significantly longer lag phase for oxidation of LDL, the higher HDL cholesterol level and the lower triacylglycerol level in subjects following a carotenoid-controlled, MUFA-enriched diet may decrease the risk of coronary heart disease.
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September 2003
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Research Article|
September 01 2003
Effects of two lipid-lowering, carotenoid-controlled diets on the oxidative modification of low-density lipoproteins in free-living humans
Kiran D. K. AHUJA;
Kiran D. K. AHUJA
1School of Human Life Sciences, University of Tasmania, Launceston, Tasmania 7250, Australia
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Emma L. ASHTON;
Emma L. ASHTON
1School of Human Life Sciences, University of Tasmania, Launceston, Tasmania 7250, Australia
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Madeleine J. BALL
1School of Human Life Sciences, University of Tasmania, Launceston, Tasmania 7250, Australia
Correspondence: Professor Madeleine Ball (e-mail Madeleine.Ball@utas.edu.au).
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Clin Sci (Lond) (2003) 105 (3): 355–361.
Article history
Received:
January 31 2003
Revision Received:
May 07 2003
Accepted:
June 02 2003
Accepted Manuscript online:
June 02 2003
Citation
Kiran D. K. AHUJA, Emma L. ASHTON, Madeleine J. BALL; Effects of two lipid-lowering, carotenoid-controlled diets on the oxidative modification of low-density lipoproteins in free-living humans. Clin Sci (Lond) 1 September 2003; 105 (3): 355–361. doi: https://doi.org/10.1042/CS20030050
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