Some hypertensive patients take diuretics that cause loss of potassium. Therefore, such patients are advised to consume banana on a regular basis to recuperate the lost potassium. Prefer foods that are high in potassium, but do not run for supplementary potassium as too much of it can be dangerous for heart. Foods that are rich in potassium are bananas, potatoes, tomatoes, oranges, milk, etc.
Calcium is required by heart to maintain proper rhythm. In addition to this, kidneys need calcium to regulate body’s sodium-water balance. Studies have showed that calcium from natural foods helps lower the blood pressure. Supplementary calcium might not work in this case, though.