To facilitate reaching its goal, the AHA is focusing on Life's Simple 7: don't smoke, increase your physical activity, eat a healthy diet, maintain a healthy body weight, and get control of your cholesterol, blood pressure and blood sugar. These contributed to already improving heart health, but they still need to be a focus for the future. For instance, about 80 million adults in the United States have high blood pressure, but nearly 20 percent don't know it. Uncontrolled high blood pressure raises the risk of stroke, heart attack or heart failure. It's sometimes called "the silent killer" because it has no symptoms.