Association Between Plasma Vitamin C Concentrations and Blood Pressure in the European Prospective Investigation Into Cancer-Norfolk Population-Based Study

Norwich Medical School, Chancellors Drive, University of East Anglia, Norwich NR4 7TJ, UK.
Hypertension (Impact Factor: 6.48). 09/2011; 58(3):372-9. DOI: 10.1161/HYPERTENSIONAHA.111.171108
Source: PubMed


The effect of fruit and vegetable consumption and blood pressure is unclear. A population-based cross-sectional study was conducted in 20 926 men and women aged 40 to 79 years participating in the European Prospective Investigation Into Cancer-Norfolk who completed a health questionnaire and attended a clinic from 1993 to 1997. The relationship between plasma vitamin C concentrations, as an indicator of fruit and vegetable intake, and systolic BP was examined. The magnitude of their association was assessed using dichotomized values of high (≥140 mm Hg) and low (<140 mm Hg) systolic blood pressure. A total of 20 926 participants (46% men; mean [SD] 58.5 years [9.2 years]) were included after excluding participants with any missing data for variables of interest. People with high vitamin C concentrations had lower clinic blood pressure. The likelihood of having high blood pressure was 22% lower (odds ratio: 0.78 [95% CI: 0.71 to 0.86]) for those who were in the top quartiles of plasma vitamin C levels compared with the bottom quartiles after adjusting for age, sex, body mass index, cholesterol, prevalent medical conditions, smoking, physical activity, alcohol consumption, social class, education, use of vitamin C-containing supplement, and antihypertensive medication. Sex-specific analysis, as well as repeated analysis after exclusion of people who used vitamin C-containing supplements or who were taking antihypertensive medication, did not alter the results. There appears to be a strong association between vitamin C concentrations, an indicator of fruit and vegetable consumption, and a lower level of blood pressure. This may provide further evidence for health benefits of dietary patterns with higher fruit and vegetable consumption.

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Available from: Phyo K Myint, May 09, 2014
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    • "We also found no changes for serum vitamin C, although folate sometimes considered a surrogate for Vitamin C and vegetable intake, was significantly higher in mtDNA J haplogroup carriers. Dietary vitamin C has been shown to increase antioxidant capacity (Cao et al. 1998), to associate with lower blood pressure (Myint et al. 2011; Ceriello 2008), but not to enhance longevity (Choi et al. 2004). Although Vit E was marginally increased in J haplotype carriers, we did not find that vitamins A and α and β carotenoids were different across mtDNA J haplogroup categories in BELFAST octo/nonagenarians unlike Semba et al. 2006 who demonstrated that low carotenoid micronutrients predicted frailty and mortality in community-living older women. "
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    ABSTRACT: Mitochondria produce cellular energy but also free-radicals, which damage cells despite an array of endogenous anti-oxidants. In Northern Europe, the mitochondrial haplogroup J has been related to longevity in nonagenarians and centenarians but also with age-related disease. Hypertension is an important contributor to atherosclerotic-related diseases and its pathogenesis is associated with increased oxidative stress. In this study, we questioned whether J haplogroup octo/nonagenarians from the Belfast Elderly Longitudinal Free-living Elderly STudy (BELFAST) study showed evidence of protective blood pressure or anti-oxidant profile which might explain their longevity advantage. Briefly, in a cross-sectional study, community-living, mentally alert (Folstein >25/30), octo/nonagenarian subjects, recruited for good health, were enlisted and consented as part of the BELFAST study, for blood pressure, anthropometric measurements and blood sampling. DNA typing for mitochondrial haplotypes was carried out with measurements for enzymatic and non-enzymatic antioxidants. J haplogroup carriers showed lower systolic blood pressure and glutathione peroxidase activity (Gpx) with higher folate measurements. There was no change in urate, bilirubin, albumin or nutrition-related antioxidants-selenium or vitamins A, C and α and β carotene. BELFAST study mtDNA J haplogroup octo/nonagenarians showed lower blood pressure and reduced glutathione peroxidase activity and higher folate, but no change for other antioxidants. These findings are of interest in view of mtDNA J haplogroup's association with increased age in some previous studies.
    Full-text · Article · Jul 2012 · Age

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    ABSTRACT: The objective of this strudy was to investigate the potential associations between oxygen radical absorbance capacity (ORAC) of fruits, vegetables, legumes and nuts, and blood pressure in type 2 diabetic patients in Tehran. In a cross-sectional study of 506 type 2 diabetic patients, aged 28-75 years, usual dietary intakes were assessed by means of a 168-item food-frequency questionnaire. To calculate the estimated hydrophilic-ORAC, total ORAC, and total phenolics (TP) of fruits, vegetables, legumes and nuts for each participant, we used the United States Department of Agriculture Database for ORAC. We examined the associations between total ORAC and TP scores, and hypertension using logistic regression. After adjustment for potential confounders, a higher total ORAC score was associated with lower risk of hypertension. The odds ratios (ORs) of systolic blood pressure (SBP) >140 mm Hg across increasing quartiles of the total ORAC score were 1.0, 0.71, 0.38 and 0.56 (P for trend=0.016). The ORs of diastolic blood pressure (DBP) >90 mm Hg across increasing quartiles of the total ORAC score were 1.0, 0.59, 0.47 and 0.35 (P for trend=0.008). Further adjustment for energy, protein and sodium intakes slightly strengthened these associations. Multivariate ORs of elevated SBP across quartiles of TP score were 1.0, 0.83, 0.41 and 0.63 (P for trend=0.027), and for elevated DBP were 1.0, 0.50, 0.40 and 0.38 (P for trend=0.006). Further adjustment for energy, protein and sodium intakes did not change the results materially. Our findings suggest that total antioxidant capacity of the dietary intake was negatively associated with hypertension in type 2 diabetic patients.Journal of Human Hypertension advance online publication, 14 June 2012; doi:10.1038/jhh.2012.19.
    Full-text · Article · Jun 2012 · Journal of human hypertension
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