Impact of increasing doses of flavonoid-rich and flavonoid-poor fruits and vegetables on antioxidant status in humans–FLAVURS study

Jin, Yannan, George, Trevor, Chong, Mary Foong-Fong, Minihane, Anne-Marie, Gordon, Michael and Lovegrove, Julie (2010) Impact of increasing doses of flavonoid-rich and flavonoid-poor fruits and vegetables on antioxidant status in humans–FLAVURS study. Proceedings of the Nutrition Society, 69 (OCE6). E453. ISSN 0029-6651

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Official URL: http://dx.doi.org/10.1017/S0029665110003162

Abstract

Emerging epidemiological evidence indicates that the consumption of fruits and vegetables (F&V) is associated with reduced risk of CVD, with evidence that dietary flavonoids present in F&V may contribute to the CVD benefits of increased F&V intake. However, a clear dose–response relationship between consumption of F&V and risk reduction is still absent. The present study investigated the effects of different amounts and types (flavonoid-rich or flavonoid-poor) of F&V intake on the antioxidant status of human subjects, as an indicator of risk of CVD. In a randomized, controlled parallel intervention study, 154 subjects (ages 30–70 years, 94 females, 60 males) who were at above average risk of developing CVD were randomly recruited into one of the 3 groups: flavonoid-rich F&V or flavonoid-poor F&V intervention group or habitual diet group (control). Subjects in the two intervention groups sequentially increased their F&V intake by 2, 4 and 6 extra portions for 6 weeks across an 18-week period. Blood samples were taken 4 times at week 0, 5, 11 and 17 for antioxidant status assessment by plasma ferric reducing antioxidant power (FRAP) and vitamin C concentrations. Both intervention groups showed significantly higher plasma FRAP values than the control group following 4 extra portion F&V (P<0.001), with the flavonoid-rich group having significantly higher FRAP values than both the flavonoid-poor and the control groups following 6 extra portions F&V (P<0.001). No significant changes were observed in the FRAP values of the control group throughout the study. The plasma vitamin C levels of the flavonoid-rich and flavonoid-poor groups were similar and significantly greater than that of the control group following 2, 4 and 6 extra portion F&V (P=0.001). In conclusion, increased consumption of flavonoid-rich or -poor F&V contributed to significant dose-response increases in vitamin C and antioxidant status of human subjects.

Item Type: Article
Subjects: B400 Nutrition
D600 Food and Beverage studies
Department: Faculties > Health and Life Sciences > Applied Sciences
Depositing User: Paul Burns
Date Deposited: 06 Nov 2014 16:56
Last Modified: 24 Oct 2017 11:26
URI: http://nrl.northumbria.ac.uk/id/eprint/17974

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