Cardio-metabolic and immunological impacts of extra virgin olive oil consumption in overweight and obese older adults: a randomized controlled trial - PubMed (original) (raw)

doi: 10.1186/s12986-015-0022-5. eCollection 2015.

Junaidah Barnett 2, Dayong Wu 2, Garry Handelman 3, Edward Saltzman 2, Thomas Wilson 3, Lijun Li 2, Junpeng Wang 2, Ascensión Marcos 4, José M Ordovás 2, Yu-Chi Lee 2, Mohsen Meydani 2, Simin Nikbin Meydani 2

Affiliations

Cardio-metabolic and immunological impacts of extra virgin olive oil consumption in overweight and obese older adults: a randomized controlled trial

Mitra Rozati et al. Nutr Metab (Lond). 2015.

Abstract

Background: Both aging and obesity are related to dysregulated immune function, which may be responsible for increased risk of infection and also chronic non-infectious diseases. Dietary lipids have been shown to impact immune and inflammatory responses and cardio-metabolic risk factors. No information on the impact of olive oil on immune responses of overweight and obese older adults is available.

Objective: We aimed to determine the effect of replacing oils used in a typical American diet with extra virgin olive oil for 3 months on immune responses and cardio-metabolic risk factors in overweight and obese older adults.

Methods: This was a randomized, single-blinded and placebo-controlled trial in 41 overweight or obese participants (aged ≥ 65) who consumed a typical American diet. Participants in the control (CON, n = 21) group were provided with a mixture of corn, soybean oil and butter, and those in the olive oil (OO, n = 20) group, with extra virgin olive oil, to replace substitutable oils in their diet. At baseline and 3 months, we measured blood pressure, biochemical and immunological parameters using fasting blood, and delayed-type hypersensitivity (DTH) skin response.

Results: Compared to the CON group, the OO group showed decreased systolic blood pressure (P < 0.05), a strong trend toward increased plasma HDL-C concentrations (P = 0.06), and increased anti-CD3/anti-CD28 -stimulated T cell proliferation (P < 0.05). No differences were found in T cell phenotype, cytokine production, and DTH response between the two groups.

Conclusions: Our results indicate that substitution of oils used in a typical American diet with extra virgin olive oil in overweight and obese older adults may have cardio-metabolic and immunological health benefits. This trial was registered at clinicaltrials.gov as NCT01903304.

Keywords: Aging; Cardio-metabolic; Immune response; Obesity; Olive oil.

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Figures

Fig. 1

Fig. 1

Study profile for recruitment and enrollment

Fig. 2

Fig. 2

Association between changes in plasma oleic acid content (%) and IL-2 production (all participants). The percent changes in plasma oleic acid were ranked in 5 quintiles, Q1 (−5.14 to-2.68); Q2, (−2.69 to −0.35); Q3, (−0.18 to 0.5); Q4, (0.89 to 2.66), and Q5, (2.78 to 7.32); N = 8 participants in each quintile. The change in IL-2 production in response to anti-CD3/anti-CD28 after 3 months is shown in Q1 and Q5. * Significantly different from Q1 by ANCOVA adjusting for age, sex and the baseline values of oleic acid and IL-2 at P < 0.01

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