Effects of Concord grape juice on ambulatory blood pressure in prehypertension and stage 1 hypertension.

Background: Consumption of flavonoid-containing foods may be useful for the management of hypertension.

Objective: We investigated whether 100% Concord grape juice lowers blood pressure in patients with prehypertension and stage 1 hypertension.

Design: We conducted a double-blind crossover study to compare the effects of grape juice (7 mL · kg⁻¹ · d⁻¹) and matched placebo beverage on 24-h ambulatory blood pressure, stress-induced changes in blood pressure, and biochemical profile.