2-part program! Lowering your blood pressure can pay off in significant reductions in your risk of strokes and heart attacks, regardless of your age and even if your readings are already in the normal range. An estimated one in four Americans has hypertension though a third don”t know it, according to the American Heart Association. The condition, called the “silent killer,” is the leading changeable cause of stroke in the United States, raising the risk sevenfold compared with people with normal blood pressure. High blood pressure is also a main source of kidney problems, which affect 8 million people in this country.