| Background: Our aim in this meta-analysis
was to determine the effect of garlic supplementation
on adiponectin and leptin serum levels.
Method: A systematic search was conducted using PubMed, Scopus, ISI Web of
Science and Cochrane Library for eligible trials up to November 2020. A fixed-effects
model was used to pool calculated effect sizes.
Results: Five trials were included in the overall analysis. Our analysis showed that
garlic supplementation did not significantly affect adiponectin (Hedges's: 0.20; 95%
CI: −0.06, 0.47; P-values
= .12) and leptin (Hedges's: 0.08; 95% CI: −0.26, 0.41; P-values
= .65) concentrations in comparison with placebo. However, in the subgroup
analysis, significantly increased serum adiponectin level was seen following garlic
supplementation in trials with a mean age of participants ˂30 years (Hedges's: 0.44;
95% CI: 0.01, 0.87; P-values
= .04), the doses ˂1.5 g/d (Hedges's: 0.38; 95% CI: 0.02,
0.71; P-values
= .04) and trials with duration ≥8 weeks (Hedges's: 0.48; 95% CI: 0.08,
0.89; P-values
= .02).
Conclusion: Overall, garlic supplementation could not change the circulatory adiponectin
and leptin levels. Subgroup analyses showed a significant reduction in adiponectin
levels in younger participants, longer duration and lower intervention dose.
However, further studies are needed to confirm the present results. |