Across 3 studies, 1 reported a moderate beneficial effect on LDL reduction, while 2 reported neutral effects. The beneficial finding came from a meta-analysis of 821 participants (MD -0.64 mmol/L, 95% CI -0.77 to -0.52), but two subsequent meta-analyses and RCTs found no significant effect, with small effect sizes and wide confidence intervals. The median study duration was 90 days, but evidence is limited and inconsistent.
Caveats: Evidence base is small (only 3 studies) — conclusions should be considered preliminary. Many of the included studies did not reach statistical significance — effect may be smaller than the predominant direction suggests. The only positive study is from 2013, while two more recent meta-analyses and an RCT found no significant effect, suggesting potential publication bias or a diminishing effect over time.
Adverse events were measured in five trials and included a diagnosis of prostate cancer, hospitalisation for influenza, appendicitis and retinal detachment but these are unlikely to be directly attributable to the intervention.
from: Green and black tea for the primary prevention of cardiovascular disease.Adverse events were measured in five trials and included a diagnosis of prostate cancer, hospitalisation for influenza, appendicitis and retinal detachment but these are unlikely to be directly attributable to the intervention.
from: Green and black tea for the primary prevention of cardiovascular disease.Adverse events were measured in five trials and included a diagnosis of prostate cancer, hospitalisation for influenza, appendicitis and retinal detachment but these are unlikely to be directly attributable to the intervention.
from: Green and black tea for the primary prevention of cardiovascular disease.Adverse events were measured in five trials and included a diagnosis of prostate cancer, hospitalisation for influenza, appendicitis and retinal detachment but these are unlikely to be directly attributable to the intervention.
from: Green and black tea for the primary prevention of cardiovascular disease.LDL cholesterol (MD -0.64 mmol/L, 95% CI -0.77 to -0.52)
mean difference 3.21 mg/dl, 95% CI = -11.02 to 4.60 (p = 0.42) for low density lipoprotein-cholesterol
the serum concentrations of high-density lipoprotein cholesterol (HDL-C) and low-density lipoprotein cholesterol (LDL-C) were substantially decreased after oolong tea consumption compared with black tea (p<0.05, p<0.01).