Yes
For example, a diet low in potassium and high in sodium is associated with high blood pressure. By contrast, a diet high in potassium and low in sodium can protect against elevation of blood pressure. It has become common knowledge that too much salt in our diet may contribute to Potassium is a chemical whichs helps to lower blood pressure by balancing out the negative effects of salt. Your kidneys help to control your blood pressure by controlling the amount of fluid stored in your body. The more fluid, the higher your blood pressure. The level of potassium intake can affect blood pressure. The effect varies with the direction (low potassium intake raises the blood pressure and high potassium intake lowers the blood pressure) and magnitude of change in potassium intake. Potassium doesn't treat or prevent heart disease. But getting enough potassium can help the heart in several ways: Better blood pressure. In a study of people with high blood pressure, taking potassium supplements lowered systolic blood pressure -- the top number -- by about 8 points. A diet high in fruits and vegetables and fat-free or low-fat dairy foods can help cut systolic blood pressure by more than 10 points in people with high 1 Potassium can lessen the effects of sodium on blood pressure. 2  The best source of potassium is food, such as fruits and vegetables, rather than supplements. 3  Talk to your doctor about the potassium level that's best for you. Eating foods rich in potassium may help protect you from high blood pressure. If you have high blood pressure, eating foods rich in potassium may lower your blood pressure to some degree. Nutritionists recommend that you eat 3,500 mg of potassium each day. Many different types of foods contain potassium. Most people can get enough potassium from their diet.
http://www.naturalnews.com/027407_potassium_blood_pressure.html http://www.bloodpressureuk.org/microsites/salt/Home/Whypotassiumhelps http://www.uptodate.com/contents/potassium-and-hypertension http://www.webmd.com/heart-disease/potassium-and-your-heart http://www.mayoclinic.org/diseases-conditions/high-blood-pressure/in-depth/high-blood-pressure/art-20046974 http://health.howstuffworks.com/wellness/food-nutrition/facts/potassium-and-blood-pressure.htm
does potassium lower blood pressure