Abstract
Background
There is growing evidence of the potential properties of nitrate-rich foods against development of hypertension (HTN) and vascular disease. In this study, we investigated the association of nitrate-containing vegetables (NCVs) with risk of HTN after 3 years of follow-up.
Methods
This prospective study was conducted on 1546 non-hypertensive subjects, aged 20–70 years. Blood pressure was measured at baseline and after 3 years and HTN was defined by the Joint National Committee on prevention, detection, evaluation and treatment of high blood pressure criteria. Dietary intake was collected using a validated semi-quantitative food frequency questionnaire (FFQ). NCVs and high-, medium- and low-NCV subcategories were defined, and the odds of HTN after 3 years according to tertiles of NCV and NCV-category intake were estimated by logistic regression and adjusted for potential variables.
Results
Mean age of participants was 38.0 ± 12.0 years at baseline and 57.0 % were women. Mean dietary intake of energy-adjusted NCV was 298.0 ± 177.3 g/day. After adjustment for total energy intake, fiber, sodium, potassium and processed meat, a significant inverse association was observed between NCV and the risk of HTN in the highest tertile category (odds ratio 0.63, 95 % confidence interval: 0.41–0.98, p for trend = 0.05). There was no significant association of 3 year risk of HTN across tertiles of low nitrate-, medium nitrate- and high-nitrate vegetables.
Conclusion
Higher dietary nitrate intake from vegetables sources may have a protective effect against development of HTN.
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Acknowledgments
We thank the TLGS participants and the field investigators of the TLGS for their cooperation and assistance in physical examinations, biochemical and nutritional evaluation and database management. This study was supported by grant no. 121 from the National Research Council of the Islamic Republic of Iran and the Research Institute for Endocrine Sciences of Shahid Beheshti University of Medical Sciences. We would like to thank Ms N.Shiva for critical editing of English grammar and syntax of the manuscript.
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This study was approved by the ethics committee of Research Institute for Endocrine Science, Shahid Beheshti University of Medical Sciences (Ethics code: IR.SBMU.RIES.REC.1394.36).
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Written informed consents were obtained from all participants.
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Golzarand, M., Bahadoran, Z., Mirmiran, P. et al. Consumption of nitrate-containing vegetables is inversely associated with hypertension in adults: a prospective investigation from the Tehran Lipid and Glucose Study. J Nephrol 29, 377–384 (2016). https://doi.org/10.1007/s40620-015-0229-6
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DOI: https://doi.org/10.1007/s40620-015-0229-6