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Dietary supplementation with a natural carotenoid mixture decreases oxidative stress

European Journal of Clinical Nutrition volume 57, pages 1135–1140 (2003)Cite this article

Abstract

Objective: To determine whether dietary supplementation with a natural carotenoid mixture counteracts the enhancement of oxidative stress induced by consumption of fish oil.

Design: A randomised double-blind crossover dietary intervention.

Setting: Hugh Sinclair Unit of Human Nutrition, School of Food Biosciences, The University of Reading, Whiteknights PO Box 226, Reading RG6 6AP, UK.

Subjects and intervention: A total of 32 free-living healthy nonsmoking volunteers were recruited by posters and e-mails in The University of Reading. One volunteer withdrew during the study. The volunteers consumed a daily supplement comprising capsules containing fish oil (4 × 1 g) or fish oil (4 × 1 g) containing a natural carotenoid mixture (4 × 7.6 mg) for 3 weeks in a randomised crossover design separated by a 12 week washout phase. The carotenoid mixture provided a daily intake of β-carotene (6.0 mg), α-carotene (1.4 mg), lycopene (4.5 mg), bixin (11.7 mg), lutein (4.4 mg) and paprika carotenoids (2.2 mg). Blood and urine samples were collected on days 0 and 21 of each dietary period.

Results: The carotenoid mixture reduced the fall in ex vivo oxidative stability of low-density lipoprotein (LDL) induced by the fish oil (P=0.045) and it reduced the extent of DNA damage assessed by the concentration of 8-hydroxy-2′-deoxyguanosine in urine (P=0.005). There was no effect on the oxidative stability of plasma ex vivo assessed by the oxygen radical absorbance capacity test. β-Carotene, α-carotene, lycopene and lutein were increased in the plasma of subjects consuming the carotenoid mixture. Plasma triglyceride levels were reduced significantly more than the reduction for the fish oil control (P=0.035), but total cholesterol, HDL and LDL levels were not significantly changed by the consumption of the carotenoid mixture.

Conclusions: Consumption of the natural carotenoid mixture lowered the increase in oxidative stress induced by the fish oil as assessed by ex vivo oxidative stability of LDL and DNA degradation product in urine. The carotenoid mixture also enhanced the plasma triglyceride-lowering effect of the fish oil.

Sponsorship: The study was supported by funding from the Greek Studentship Foundation and from Unilever Bestfoods plc. Carotenoids were contributed by Overseal Foods plc.

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Authors and Affiliations

  1. Hugh Sinclair Unit of Human Nutrition, School of Food Biosciences, The University of Reading, Whiteknights, Reading, UK

    S Kiokias & M H Gordon

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  1. S Kiokias
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  2. M H Gordon
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Guarantor: MH Gordon.

Contributors: SK performed the practical work and analysed the data from the study, and contributed to the preparation of the manuscript. MHG contributed to the experimental design, data analysis and preparation of the manuscript.

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Correspondence to M H Gordon.

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Kiokias, S., Gordon, M. Dietary supplementation with a natural carotenoid mixture decreases oxidative stress. Eur J Clin Nutr 57, 1135–1140 (2003). https://doi.org/10.1038/sj.ejcn.1601655

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