Abstract
In this study, we summarized the effect of soy isoflavones and soy isoflavones plus soy protein on serum concentration of tumor necrosis factor-alpha (TNF-α) among adult participants. We systematically searched Scopus, ISI Web of Science, Cochrane Library, PubMed, and clinicaltrials.gov for articles published up to May 2020. Effect size was calculated by mean change from baseline of TNF-α concentrations and its standard deviation (SD) for intervention and comparison groups. If the heterogeneity test was statistically significant, DerSimonian and Laird random effects model was used to estimate the summary of the overall effects and its heterogeneity. Nineteen and fourteen randomized clinical trials were included in our systematic review and meta-analysis, respectively. The result of overall effect size indicated a non-significant effect in serum concentration of TNF-α following soy isoflavones intake (WMD = 0.2 pg/ml, 95% CI: −0.13, 0.53; p =.226) and the combination of soy isoflavones and soy protein intake (WMD = 0.02 pg/ml, 95% CI: −0.02, 0.06; p =.286). Subgroup analyses revealed no significant change in circulatory levels of TNF-α following soy isoflavones plus soy protein intake. In conclusion, the present systematic review and meta-analysis found insufficient evidence that soy isoflavones or the combination of soy isoflavones and soy protein significantly reduce serum concentration of TNF-α.
Original language | English |
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Pages (from-to) | 3575-3589 |
Number of pages | 15 |
Journal | Phytotherapy Research |
Volume | 35 |
Issue number | 7 |
Early online date | 14 Feb 2021 |
DOIs | |
Publication status | Published - Jul 2021 |
Bibliographical note
We are extremely grateful to the data collection team at the Neyshabur University of Medical Sciences. This meta-analysis andsystematic review was financially supported by Neyshabur Universityof Medical Sciences (Grant number: 98-01-149. Ethical code: IR.NUMS.REC.1399.006)Data Availability Statement
The data that support the findings of this study are available from the corresponding author upon reasonable request.Keywords
- meta- analysis
- soy isoflavones
- soy protein
- systematic review
- TNF-alpha
- tumor necrosis factor alpha
- tumor necrosis factor-alpha
- TNF-α
- meta-analysis