Blueberries may lower cardiovascular risk by up to 20 percent Published Saturday 23 February 2019 By Ana Sandoiu Fact checked by Gianna D'Emilio The phytochemicals that give blueberries their blue color can significantly improve cardiovascular health, finds a new two-part study. The positive effect that blueberries can have on blood pressure is comparable to that of hypertension drugs. Dubbed "the silent killer" because it has no visible symptoms in its early stages, hypertension affects approximately 1 in 3 adults in the United States. The condition puts a strain on the cardiovascular system, which in the long run may contribute to heart failure , stroke , and kidney failure. The National Institutes of Health (NIH) recommend that people with high blood pressure stay in control of the condition by eating healthfully, exercising, not smoking, and maintaining a healthy weight. But should you eat ...