Effect of green tea, caffeine and capsaicin supplements on the anthropometric indices: A meta-analysis of randomized clinical trials.

We conducted a meta-analysis to assess the effect of green tea, caffeine and capsaicin supplements on the anthropometric indices in adults. PubMed/Medline, Scopus, Cochran and Web of Science databases were searched up to March 2017. Green tea significantly reduced weight by −0.65 kg (−1.10 to −0.20, P = 0.005), body mass index (BMI) by −0.26 kg/m 2 (−0.43 to −0.10, P = 0.002) and waist circumference by −1.11 cm (−1.99 to −0.23, P = 0.01) but not percent of body fat (PBF) (−1.42%, 95% CI: −3.02 to 0.18, P = 0.08). Caffeine supplement had no effect on weight (−2.99 kg, 95% CI: −7.83 to 1.41, P = 0.18). We observed a significant weight loss after capsaicin supplement (−0.50 kg; 95% CI: −0.90 to −0.11, P = 0.01) but PBF did not change significantly from baseline (0.11%, 95% CI: −0.22 to 0.43, P = 0.51). Green tea and capsaicin supplements have a significant mild weight-lowering effect. On the contrary, it seems caffeine had no effect on weight. [ABSTRACT FROM AUTHOR]