Do berries hold the key to blood pressure control? A systematic review of blackcurrants and raspberries

This systematic review and meta-analysis examine whether blackcurrant and raspberry consumption can influence blood pressure (BP). Given their rich polyphenol content and recognized antioxidant properties, these berries have garnered interest as potential dietary interventions for managing hypertension, a leading risk factor for cardiovascular disease. However, findings remain inconclusive, and this study aims to clarify their impact through an analysis of randomized controlled trials (RCTs).

A total of 10 RCTs involving 420 participants were included. The analysis revealed that raspberry consumption had no significant effect on systolic blood pressure (SBP) or diastolic blood pressure (DBP). Similarly, blackcurrant supplementation showed no meaningful reduction in SBP or DBP. These findings challenge earlier studies suggesting a link between berry consumption and vascular health.

Despite their nutritional richness, including high levels of flavonoids and anthocyanins, these berries’ short-term effects on BP appear limited. The mechanisms by which polyphenols in berries might influence vascular health—such as nitric oxide production and endothelial function—may require higher doses or longer intervention periods to yield measurable benefits. Variability in study designs, dosages, and participant characteristics could also contribute to these mixed results.

The study underscores the need for larger, more controlled trials to explore the nuanced relationship between berry consumption and cardiovascular health. While the current evidence does not support significant antihypertensive effects, the potential for long-term benefits through regular dietary inclusion of berries remains an area for future research.