A Mediterranean diet reduces F2-Isoprostanes and triglycerides among older Australian men and women after 6 months

Courtney Rose Davis, Janet Bryan, Jonathan M. Hodgson, Richard Woodman, Karen J. Murphy

    Research output: Contribution to journalArticle

    10 Citations (Scopus)

    Abstract

    Background: Health benefits of a Mediterranean dietary pattern have been shown. However, there are few data on the effects of increased adherence to a Mediterranean diet (MedDiet) in non-Mediterranean countries.

    Objective: We aimed to determine whether adherence to a MedDiet would result in changes in plasma lipids, glucose and insulin, high-sensitivity C-reactive protein (hs-CRP), and F2-isoprostanes (F2-IsoPs) in an Australian population.

    Methods: The study was a 6-mo parallel, randomized, controlled dietary intervention trial. We recruited 166 participants aged ≥65 y. Participants were stratified on body mass index, sex, and age and assigned to receive either a MedDiet or a habitual diet (HabDiet). The primary outcome was cognitive function, reported elsewhere. As secondary outcomes, assessment of fasting total, LDL, and HDL cholesterol; triglycerides (TGs); glucose; insulin; hs-CRP; and F2-IsoPs was completed at baseline and at 3 and 6 mo. The MedDiet group followed a prescribed diet containing 15-45 mL extravirgin olive oil/d, abundant vegetables, fruit, nuts, legumes, and whole grains, as well as moderate fish, poultry, and dairy foods. Dietary intake was measured by 3-d weighed food records at baseline and at 2 and 4 mo. Results were analyzed by using linear mixed-effects models.

    Results: Compared with the HabDiet, the MedDiet resulted in lower TGs at 3 mo (mean difference: 20.15 mmol/L; 95% CI: -0.23, -0.07 mmol/L; P < 0.001) and 6 mo (mean difference: -0.09 mmol/L; 95% CI: -0.18, -0.01 mmol/L; P = 0.03) and lower F2-IsoPs at 3 mo (mean difference: -103.5 pmol/L; 95% CI: -154.2, -52.7 pmol/L; P < 0.001) and 6 mo (-65.4 pmol/L; 95% CI: -117.1, -13.7 pmol/L; P < 0.001). Lipoprotein, glucose and insulin, and hs-CRP concentrations were not significantly different between groups. Conclusion: A high adherence to a MedDiet for 6 mo resulted in a significant reduction in TGs and F2-IsoPs among older Australians.

    Original languageEnglish
    Pages (from-to)1348-1355
    Number of pages8
    JournalJournal of Nutrition
    Volume147
    Issue number7
    DOIs
    Publication statusPublished - 1 Jul 2017

    Keywords

    • Cardiovascular risk factors
    • F-isoprostanes
    • Mediterranean diet
    • Older Australians
    • Oxidative stress

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