Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Black tea has been investigated for its potential effects on blood pressure, and there is some scientific evidence suggesting modest benefits. Several randomized controlled trials and meta-analyses have examined the impact of black tea consumption on hypertension. These studies generally report that regular intake of black tea (usually 3-4 cups per day) can lead to small but statistically significant reductions in both systolic and diastolic blood pressure in adults with or without hypertension. The proposed mechanisms include the presence of flavonoids and other polyphenols in black tea, which may improve endothelial function and promote vasodilation by enhancing nitric oxide production. Black tea's antioxidant properties may also contribute to improved vascular health and reduced blood pressure. However, the overall magnitude of the effect is modest, typically in the range of a 2-4 mmHg reduction in systolic blood pressure. Some studies have shown no significant effect, and individual responses can vary. Additionally, black tea contains caffeine, which can acutely raise blood pressure in some individuals; thus, long-term effects might differ from short-term measurements. In conclusion, while black tea is not a substitute for antihypertensive medications or lifestyle modifications, there is scientific evidence to support a mild beneficial effect on blood pressure when consumed regularly. The evidence base, while promising, is not robust enough to recommend black tea as a primary therapy for hypertension, but it can be considered as a supportive dietary component.

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