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Inorganic nitrate, a natural anti-obesity agent : A systematic review and meta-analysis of animal studies

Bahadoran, Zahra ; Jeddi, Sajad ; Gheibi, Sevda LU ; Mirmiran, Parvin ; Kashfi, Khosrow and Ghasemi, Asghar (2020) In EXCLI Journal 19. p.972-983
Abstract

Evidence for potential effects of inorganic nitrate (NO3) on body weight is limited to inconsistent findings of animal experiments. In this systematic review and meta-analysis, we aimed to quantify the overall effect of inorganic NO3, administered via drinking water, on body weight gain in rats. We searched PubMed, Scopus, and Embase databases, and the reference lists of published papers. Experiments on male rats, reported data on body weight in NO3-treated animals and controls, were included for quality assessment, meta-analyses, subgroup anal-yses, and meta-regressions. Of 173 initially obtained studies, 11 were eligible to be included in the analyses, which covered the years 2004 to 2019 and included... (More)

Evidence for potential effects of inorganic nitrate (NO3) on body weight is limited to inconsistent findings of animal experiments. In this systematic review and meta-analysis, we aimed to quantify the overall effect of inorganic NO3, administered via drinking water, on body weight gain in rats. We searched PubMed, Scopus, and Embase databases, and the reference lists of published papers. Experiments on male rats, reported data on body weight in NO3-treated animals and controls, were included for quality assessment, meta-analyses, subgroup anal-yses, and meta-regressions. Of 173 initially obtained studies, 11 were eligible to be included in the analyses, which covered the years 2004 to 2019 and included a total of 43 intervention (n=395) and 43 control (n=395) arms. Overall, the final body weights were significantly lower in the NO3-supplemented groups compared to controls (WMD= –16.8 g, 95 % CI= –27.38, –6.24; P=0.002). Doses of NO3 higher than the median (> 72.94 mg L-1 d-1) and longer NO3 exposure (> 8 weeks) resulted in greater mean differences (WMD= –31.92 g, 95 % CI= –52.90, –10.94 and WMD= –23.16 g, 95 % CI= –35.64, –10.68 g). After exclusion of experiments using high doses of NO3 (> 400 mg L-1 d-1), the overall mean differences in body weights between the groups decreased by approxi-mately 37 % but remained statistically significant (WMD= –10.11 g, 95 % CI= –19.04, –1.19, P=0.026). Mean changes in body weight were affected by age, baseline values in body weight, and the duration of the studies. These preliminary experimental findings strongly support the hypothesis that NO3 can be considered as a natural anti-obesity agent.

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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Body weight, Nitrate, Obesity, Rats, Systematic review and meta-analysis
in
EXCLI Journal
volume
19
pages
12 pages
publisher
Univ Mainz-Med Dept
external identifiers
  • pmid:32788911
  • scopus:85088899070
ISSN
1611-2156
DOI
10.17179/excli2020-2515
language
English
LU publication?
yes
id
202c5c46-56bf-4b10-a822-ba255ebf7dda
date added to LUP
2020-08-13 12:57:21
date last changed
2025-01-10 16:48:57
@article{202c5c46-56bf-4b10-a822-ba255ebf7dda,
  abstract     = {{<p>Evidence for potential effects of inorganic nitrate (NO<sub>3</sub>) on body weight is limited to inconsistent findings of animal experiments. In this systematic review and meta-analysis, we aimed to quantify the overall effect of inorganic NO<sub>3</sub>, administered via drinking water, on body weight gain in rats. We searched PubMed, Scopus, and Embase databases, and the reference lists of published papers. Experiments on male rats, reported data on body weight in NO<sub>3</sub>-treated animals and controls, were included for quality assessment, meta-analyses, subgroup anal-yses, and meta-regressions. Of 173 initially obtained studies, 11 were eligible to be included in the analyses, which covered the years 2004 to 2019 and included a total of 43 intervention (n=395) and 43 control (n=395) arms. Overall, the final body weights were significantly lower in the NO<sub>3</sub>-supplemented groups compared to controls (WMD= –16.8 g, 95 % CI= –27.38, –6.24; P=0.002). Doses of NO<sub>3</sub> higher than the median (&gt; 72.94 mg L<sup>-1</sup> d<sup>-1</sup>) and longer NO<sub>3</sub> exposure (&gt; 8 weeks) resulted in greater mean differences (WMD= –31.92 g, 95 % CI= –52.90, –10.94 and WMD= –23.16 g, 95 % CI= –35.64, –10.68 g). After exclusion of experiments using high doses of NO<sub>3</sub> (&gt; 400 mg L<sup>-1</sup> d<sup>-1</sup>), the overall mean differences in body weights between the groups decreased by approxi-mately 37 % but remained statistically significant (WMD= –10.11 g, 95 % CI= –19.04, –1.19, P=0.026). Mean changes in body weight were affected by age, baseline values in body weight, and the duration of the studies. These preliminary experimental findings strongly support the hypothesis that NO<sub>3</sub> can be considered as a natural anti-obesity agent.</p>}},
  author       = {{Bahadoran, Zahra and Jeddi, Sajad and Gheibi, Sevda and Mirmiran, Parvin and Kashfi, Khosrow and Ghasemi, Asghar}},
  issn         = {{1611-2156}},
  keywords     = {{Body weight; Nitrate; Obesity; Rats; Systematic review and meta-analysis}},
  language     = {{eng}},
  pages        = {{972--983}},
  publisher    = {{Univ Mainz-Med Dept}},
  series       = {{EXCLI Journal}},
  title        = {{Inorganic nitrate, a natural anti-obesity agent : A systematic review and meta-analysis of animal studies}},
  url          = {{http://dx.doi.org/10.17179/excli2020-2515}},
  doi          = {{10.17179/excli2020-2515}},
  volume       = {{19}},
  year         = {{2020}},
}