Blackberries Decrease Artery Stiffness and Repair Blood Vessels
The study tested 51 patients that met at least three criteria for metabolic syndrome, including waist circumference measurements, high triglycerides, low high-density lipoprotein (HDL) cholesterol levels, high blood pressure and/or symptoms of glucose intolerance. The subjects were split into two groups; one received 750 milligrams per day of black raspberry extract for 12 weeks, while the other group received a placebo.
The researchers assessed the radial artery augmentation index, a measure for blood vessel wall stiffness, and values for this measurement decreased by 5 percent in the black raspberry group. The placebo group’s levels increased by 3 percent.
In addition, EPC counts increased in the black raspberry group by 19 microliters, versus a drop of 28 microliters in the placebo group. Black raspberries contain a number of heart-healthy compounds, including phenolic acids, resveratrol, flavonoids and tannins.