A systematic review including 24 studies with a total of 1404 subjects was abstracted in DARE. The meta-analysis showed a non-statistically significant effect of fibre supplementation on systolic BP of -1.13 mmHg (95% CI: -2.49 to 0.23) and a statistically significant effect on diastolic BP of -1.26 mmHg (95% CI: -2.04 to -0.48).
Comment: The quality of evidence is downgraded by sparse data and possibility of publication bias (The funnel plot showed that there was a possibility that more small trials showing large reductions in BP were included).