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Effects of grape products on inflammation and oxidative stress: A systematic review and meta‐analysis of randomized controlled trials
Author(s) -
Ghalishourani Samira Sadat,
Farzollahpour Forough,
Shirinbakhshmasoleh Mina,
Kolahdouz Shakiba,
Ghaedi Ehsan,
Behrouzian Mahsa,
Haghighian Hossein Khadem,
Campbell Marilyn S.,
Asbaghi Omid,
Moodi Vihan
Publication year - 2021
Publication title -
phytotherapy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.019
H-Index - 129
eISSN - 1099-1573
pISSN - 0951-418X
DOI - 10.1002/ptr.7120
Subject(s) - meta analysis , malondialdehyde , medicine , oxidative stress , cochrane library , randomized controlled trial , c reactive protein , grape seed extract , inflammation , antioxidant capacity , phytotherapy , tumor necrosis factor alpha , gastroenterology , traditional medicine , pathology , alternative medicine
This systematic review and meta‐analysis of randomized controlled trials (RCTs) were conducted to determine the effects of grapes and grape products on inflammation and oxidative stress among adults. PubMed, Scopus, ISI Web of Science, and Cochrane Library databases were searched up to July 2020 to identify RCTs investigating the effects of grape and grape products on inflammatory and oxidative stress markers. Weighted mean differences (WMD) were pooled using a random‐effects model. Of the 8,962 identified studies, 24 RCTs (27 arms) were included in the statistical analysis. Grape products significantly reduced serum C‐reactive protein (CRP) levels (WMD: −0.35 mg/L; 95% CI: −0.62, −0.09, p = .008), but they had no significant effect on serum tumor necrosis factor‐alpha (TNF‐α) (WMD = −1.08 pg/ml; 95% CI: −2.29, 0.11, p = .07), interleukin‐6 (IL‐6) (WMD = 0.13 pg/ml; 95% CI: −0.35, 0.60, p = .60), total antioxidant capacity (TAC) (WMD = 0.15; 95% CI: −0.35, 0.65, p = .54), or malondialdehyde (MDA) (WMD = 0.14; 95% CI: −0.64, 0.92, p = .72). The analysis indicated possible decreasing effects of grapes and grape products on CRP, but they might not be able to change IL‐6, TNF‐α, TAC, and MDA concentrations. Nonetheless, further studies are warranted before definitive conclusions may be reached.