Have you ever noticed the deep purple color of blackberries and boysenberries?
"The deeper the color of fruits and vegetables, the higher the antioxidant activity. Oxygen renegades are the target of antioxidants. When an oxygen molecule loses an electron, it becomes what is called a free radical and begins searching for a replacement. In trying to steal an electron from other healthy cells, free radicals cause damage to healthy cells and create scores of new free radicals. Free radicals cause mutations in DNA, the genetic material in the cells, and not only destroy healthy cells but turn the fats in many cells rancid, which disrupts cell metabolism. After years of these silent assaults in the body, individuals can develop a chronic disease or illness ranging from atherosclerosis to cancer, and experience an acceleration in the aging process."
(Source: Nutrition Almanac - Fifth Edition by, Lavon J. Dunne, p 137)
Berries for Blood Pressure?!
According to an article on the Real Age website, berries can be good for lowering blood pressure and increasing HDL ("good" cholesterol).