52 The study by Curtis et al indicated that nitrate-rich beetroot juice significantly lowered the resting diastolic blood pressure in patients with COPD, although a further reduction in mean arterial pressure was noted, it did not reach statistical significance. 46 Friis’s research also observed that nitrate-rich beetroot juice significantly reduced diastolic blood pressure in patients with COPD but had no effect on systolic pressure. 19 A systematic review and meta-analysis incorporating eight original studies found no significant effect of beetroot juic
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