Cited by 1,069Nutritional Studies and DietNitric Oxide and Endothelin EffectsPhytochemicals and Antioxidant Activities

Food sources of nitrates and nitrites: The physiologic context for potential health benefits

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Hord, Norman G, Tang, Yaoping, Bryan, Nathan S·2009·The American Journal of Clinical Nutrition

Abstract

The presence of nitrates and nitrites in food is associated with an increased risk of gastrointestinal cancer and, in infants, methemoglobinemia. Despite the physiologic roles for nitrate and nitrite in vascular and immune function, consideration of food sources of nitrates and nitrites as healthful dietary components has received little attention. Approximately 80% of dietary nitrates are derived from vegetable consumption; sources of nitrites include vegetables, fruit, and processed meats. Nitrites are produced endogenously through the oxidation of nitric oxide and through a reduction of nitrate by commensal bacteria in the mouth and gastrointestinal tract. As such, the dietary provision of nitrates and nitrites from vegetables and fruit may contribute to the blood pressure-lowering effects of the Dietary Approaches to Stop Hypertension (DASH) diet. We quantified nitrate and nitrite concentrations by HPLC in a convenience sample of foods. Incorporating these values into 2 hypothetical dietary patterns that emphasize high-nitrate or low-nitrate vegetable and fruit choices based on the DASH diet, we found that nitrate concentrations in these 2 patterns vary from 174 to 1222 mg. The hypothetical high-nitrate DASH diet pattern exceeds the World Health Organization's Acceptable Daily Intake for nitrate by 550% for a 60-kg adult. These data call into question the rationale for recommendations to limit nitrate and nitrite consumption from plant foods; a comprehensive reevaluation of the health effects of food sources of nitrates and nitrites is appropriate. The strength of the evidence linking the consumption of nitrate- and nitrite-containing plant foods to beneficial health effects supports the consideration of these compounds as nutrients.

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Crossref · 10.3945/ajcn.2008.27131

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  • Nitrate dosing amounts (300-600 mg or 0.1 mmol/kg/day) appear to be well tolerated without significant alterations in hemodynamics or clinical boundaries of hepatorenal and muscle enzyme status.

    “These dosing amounts appear to be well tolerated when consumed as both supplemental [587] and supplemental sources [588] without significant alterations in hemodynamics or clinical boundaries of hepatorenal and muscle enzyme status [478, 589].”

    From ISSN exercise & sports nutrition review update: research & recommendations (2018) · cites this paper as [587]

    The ‘Estimating Human Nitrate and Nitrite Exposure Levels’ section describes typical dietary exposure as apparently safe, and ‘Potential Contexts for Nitrate- and Nitrite-Associated Toxicities’ reports no methemoglobinemia in the cited human nitrate-exposure studies (page numbers unavailable). The paper does not establish that the stated 300–600 mg or 0.1 mmol/kg/day dosing was well tolerated without changes in hemodynamics or hepatorenal and muscle-enzyme measures. It also reports blood-pressure lowering from nitrite, rather than a general absence of hemodynamic effects. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • This may be due to greater responsiveness resulting from baseline NO deficiency.

    “possibly due to greater responsiveness resulting from baseline NO deficiency [112,155,245].”

    From Dietary Nitrate-Rich Vegetables as Natural Modulators of Health: Mechanisms and Benefits in Ageing Populations (2026) · cites this paper as [112]

    In “Vascular Nitric Oxide Production,” the paper says nitrite can substitute for lost eNOS-derived nitric oxide in eNOS-deficient mice. “Quantifying the Nitrite Economy” likewise says nitrite may support vascular function when nitric oxide is limiting. These passages support a response under NO-deficient conditions, but do not establish greater responsiveness than in people or tissues without baseline deficiency; page numbers were not provided in our copy. (LLM, conf=0.78)

    Experimental — accuracy not yet measured
  • Older individuals may experience substantial improvements in blood pressure and endothelial function after consuming nitrates.

    “clinical studies suggest that older individuals may experience substantial improvements in blood pressure and endothelial function after consuming nitrates”

    From Dietary Nitrate-Rich Vegetables as Natural Modulators of Health: Mechanisms and Benefits in Ageing Populations (2026) · cites this paper as [112]

    The Introduction describes nitrate-derived compounds as a plausible means of lowering blood pressure, and the Nitric Oxide Production in Tissues section reports acute blood-pressure reduction with nitrite infusion in humans. The section on endogenous and diet-derived nitric oxide generation discusses an age-related impairment, but not a clinical study showing that older individuals improve their blood pressure and endothelial function after consuming nitrates. The copy also does not establish the claimed magnitude of improvement. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Recent work proposed that the DASH diet's blood pressure benefits stem from the high nitrate content of certain foods it includes.

    “recent research has suggested that the beneficial effects of the DASH diet on BP are related to the high inorganic nitrate content of some of the food products included in the DASH dietary plan (e.g., green leafy and root vegetables) (9).”
  • Inorganic nitrate is present in numerous foodstuffs and is abundant in green leafy vegetables and beetroot.

    “Inorganic nitrate is present in numerous foodstuffs and is abundant in green leafy vegetables and beetroot.”

    From Dietary Nitrate Supplementation and Exercise Performance (2014) · cites this paper as [7]

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Research works printed but not linked: 4

  1. [20]20. Reichert ETMS. On the physiological action of potassium nitrite. Am J Med Sci 1880;159:158-80.
  2. [67]67. Wang ZHTX, Wei YS, Li SX. Nitrate accumulation and its regulation by nutrient management in vegetables. In: Balanceable fertilization and high quality vegetables. Beijing, China: China Agricultural University Press, 2000.
  3. [81]81. Cornblath M, Hartmann AF. Methhemoglobinaemia in young infants. J Pediatr 1948;33:421-5.
  4. [97]97. de Kok TM, Engels LG, Moonen EJ, Kleinjans JC. Inflammatory bowel disease stimulates formation of carcinogenic N-nitroso com- pounds. Gut 2005;54:731.

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Authors
Hord, N. G., Tang, Y., & Bryan, N. S.
Affiliations
Brown Foundation Institute of Molecular Medicine for the Prevention of Human Diseases (US)
Corresponding author
Bryan, Nathan S
Venue
The American Journal of Clinical Nutrition
Publisher
Elsevier BV
Published
2009-07
Volume
90
Issue
1
Pages
1-10
ISSN
0002-9165 (ISSN-L)
OpenAlex
W2114325309
Cited by
1,069
References
105
Citations by year
2026: 53 · 2025: 66 · 2024: 47 · 2023: 77 · 2022: 79 · 2021: 80 · 2020: 66 · 2019: 74 · 2018: 70 · 2017: 87 · 2016: 66 · 2015: 73 · 2014: 48 · 2013: 51 · 2012: 42
FWCI
5.90
Type
journal article
Language
en
Open access
Locations
  • American Journal of Clinical Nutrition (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Nutritional Studies and Diet
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Health Sciences › Medicine › Biochemistry › Phytochemicals and Antioxidant Activities
Keywords
dietary nitrate, dietary nitrite, vegetable consumption, fruit consumption, processed meat, DASH diet, blood pressure reduction, nitric oxide, commensal bacteria, methemoglobinemia, gastrointestinal cancer risk, acceptable daily intake, dietary habits
MeSH terms
Animals, Diet, Food Analysis, Food Handling, Fruit, Health, Humans, Meat, Nitrates, Nitric Oxide, Nitrites, Vegetables

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