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A randomized clinical trial of the effects of leafy green vegetables and inorganic nitrate on blood pressure.
Karolinska Institutet, Stockholm, Sweden.
Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Åstrand Laboratory of Work Physiology, Research group for Mitokondriell funktion och metabolisk kontroll.ORCID iD: 0000-0002-1343-8656​
Karolinska Institutet, Stockholm, Sweden.
Karolinska Institutet, Stockholm, Sweden.
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2020 (English)In: American Journal of Clinical Nutrition, ISSN 0002-9165, E-ISSN 1938-3207, Vol. 111, no 4, p. 749-756, article id nqaa024Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: A diet rich in fruits and vegetables is associated with lowering of blood pressure (BP), but the nutrient(s) responsible for these effects remain unclear. Research suggests that inorganic nitrate present in leafy green vegetables is converted into NO in vivo to improve cardiovascular function.

OBJECTIVE: In this study, we evaluated the effect of leafy green vegetables on BP in subjects with elevated BP, with the aim of elucidating if any such effect is related to their high nitrate content.

DESIGN: We enrolled 243 subjects, 50-70 y old, with a clinic systolic BP (SBP) of 130-159 mm Hg. After a 2-wk run-in period on a nitrate-restricted diet the subjects were randomly assigned to receive 1 of the following 3 interventions daily for 5 wk: low-nitrate vegetables + placebo pills, low-nitrate vegetables + nitrate pills (300 mg nitrate), or leafy green vegetables containing 300 mg nitrate + placebo pills. The primary end point measure was the difference in change in 24 h ambulatory SBP between the groups.

RESULTS: A total of 231 subjects (95%) completed the study. The insignificant change in ambulatory SBP (mean ± standard deviation) was -0.6 ± 6.2 mm Hg in the placebo group, -1.2 ± 6.8 mm Hg in the potassium nitrate group, and -0.5 ± 6.6 mm Hg in the leafy green vegetable group. There was no significant difference in change between the 3 groups.

CONCLUSIONS: A 5-wk dietary supplementation with leafy green vegetables or pills containing the same amount of inorganic nitrate does not decrease ambulatory SBP in subjects with elevated BP. This trial was registered at clinicaltrials.gov as NCT02916615.

Place, publisher, year, edition, pages
Oxford University Press, 2020. Vol. 111, no 4, p. 749-756, article id nqaa024
Keywords [en]
blood pressure, dietary nitrate, hypertension, leafy green vegetables, nitric oxide
National Category
Nutrition and Dietetics
Research subject
Medicine/Technology
Identifiers
URN: urn:nbn:se:gih:diva-6080DOI: 10.1093/ajcn/nqaa024ISI: 000525318600005PubMedID: 32091599OAI: oai:DiVA.org:gih-6080DiVA, id: diva2:1414760
Available from: 2020-03-16 Created: 2020-03-16 Last updated: 2020-05-04Bibliographically approved

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Larsen, Filip J

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