Cited by 300Nitric Oxide and Endothelin EffectsGut microbiota and healthPhytochemicals and Antioxidant Activities

Dietary nitrate in man: friend or foe?

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McKnight, G. M., Duncan, C. W., Leifert, C., Golden, M. H.·1999·British Journal of Nutrition

Abstract

Based on the premise that dietary nitrate is detrimental to human health, increasingly stringent regulations are being instituted to lower nitrate levels in food and water. Not only does this pose a financial challenge to water boards and a threat to vegetable production in Northern Europe, but also may be eliminating an important non-immune mechanism for host defence. Until recently nitrate was perceived as a purely harmful dietary component which causes infantile methaemoglobinaemia, carcinogenesis and possibly even teratogenesis. Epidemiological studies have failed to substantiate this. It has been shown that dietary nitrate undergoes enterosalivary circulation. It is recirculated in the blood, concentrated by the salivary glands, secreted in the saliva and reduced to nitrite by facultative Gram-positive anaerobes (Staphylococcus sciuri and S. intermedius) on the tongue. Salivary nitrite is swallowed into the acidic stomach where it is reduced to large quantities of NO and other oxides of N and, conceivably, also contributes to the formation of systemic S-nitrosothiols. NO and solutions of acidified nitrite, mimicking gastric conditions, have been shown to have antimicrobial activity against a wide range of organisms. In particular, acidified nitrite is bactericidal for a variety of gastrointestinal pathogens such as Yersinia and Salmonella.NO is known to have vasodilator properties and to modulate platelet function, as are S-nitrosothiols. Thus, nitrate in the diet, which determines reactive nitrogen oxide species production in the stomach (McKnight et al.1997), is emerging as an effective host defence against gastrointestinal pathogens, as a modulator of platelet activity and possibly even of gastrointestinal motility and microcirculation. Therefore dietary nitrate may have an important therapeutic role to play, not least in the immunocompromised and in refugees who are at particular risk of contracting gastroenteritides.

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Research works printed but not linked: 12

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Authors
McKnight, G. M., Duncan, C. W., Leifert, C., & Golden, M. H.
Affiliations
University of Aberdeen (GB)
Corresponding author
Golden, M. H.
Venue
British Journal of Nutrition
Published
1999-05
Volume
81
Issue
5
Pages
349-358
ISSN
  • 0007-1145 (ISSN-L)
  • 1475-2662
OpenAlex
W2146852783
Cited by
300
References
96
Citations by year
2026: 1 · 2025: 6 · 2024: 5 · 2023: 6 · 2022: 4 · 2021: 6 · 2020: 9 · 2019: 6 · 2018: 8 · 2017: 8 · 2016: 13 · 2015: 16 · 2014: 17 · 2013: 17 · 2012: 23
FWCI
0.68
Type
journal article
Language
en
Open access
Locations
  • British Journal Of Nutrition (publishedVersion)
  • PubMed (publishedVersion)
  • Newcastle University ePrints (Newcastle Univesity)
Topics
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
  • Health Sciences › Medicine › Biochemistry › Phytochemicals and Antioxidant Activities
Keywords
dietary nitrate, nitric oxide, salivary nitrite, S-nitrosothiols, antimicrobial activity, enteric pathogens, host defense, platelet function, methemoglobinemia, nitrate toxicity
MeSH terms
Bacteria, Bacterial Infections, Cardiovascular Diseases, Diet, Humans, Intestines, Methemoglobinemia, Neoplasms, Nitrates, Nitrites, Saliva, Stomach, Reactive Oxygen Species

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