Sodium is the number one enemy to people with high blood pressure. Reducing sodium in the diet is tricky, as it is present in most canned or prepackaged food. The recommended dose of sodium is between 1,500 to 2,300 mg a day, and people with hypertension should aim for the lower end of the spectrum.
There are two nutrients that help control blood pressure when consumed in adequate doses: potassium and calcium. Low intake of either one increases the risk of hypertension and makes it more difficult to control high blood pressure, even when you take medication.
Potassium works by helping balance the body's water, which helps the body to maintain appropriate blood pressure. Foods high in potassium include orange and prune juice, cottage cheese, skim milk, canned sardines, avocados and banana.
Calcium helps regulate blood pressure as well, so it should be consumed daily in appropriate quantities (1,000 mg per day). Foods high in calcium include dairy products, almonds, beans, spinach and broccoli.www.ehow.com/way_5375531_diet-hypertension.html