Once your blood pressure medications are discontinued, you will be closely monitored to make sure you do not encounter any difficulty. If you do not own a home blood pressure monitor, the investigators will provide one for you to use during the study so that you can keep a daily record of your blood pressure readings. The investigators will ask you to call us every three days to report your blood pressure readings. Less than 20% of patients have any significant increase in their blood pressure during this short time off of therapy. After you have stopped taking your medication, dieticians at the hospital will make you low salt meals to eat at home for seven days. On the seventh day of the low salt diet, you will be asked to begin a 24-hour urine collection that you will bring with you when you are admitted to the hospital that evening. That morning, you will be required to come to the Clinical Research Center for a one-hour test to check if your body is in the correct salt balance. You will return that evening to the inpatient Clinical Research Center where you will be admitted for your study that will occur the next morning. On the morning of your low salt study, you will have naturally occurring hormones administered and blood samples drawn from an intravenous needle. The investigators will also take ultrasound pictures of your heart to see how salt and hormones affect the way the heart functions. These tests will last approximately five hours and you will be discharged around 2:00 PM. For the next five days, you will be placed on a high salt diet. During these five days, you will eat all your own food, but the investigators will give you some supplements to eat with your meals. After five days on your high salt diet, on the morning of your second admission to the hospital, you will be asked to begin a final 24-hour urine collection. That morning, you will again be required to come to the Clinical Research Center for a one-hour test to check if your body is in the correct salt balance. You will return that evening to the inpatient Clinical Research Center where you will be admitted for your final study that will occur the next morning. The same study that was done for the low salt study will be repeated for the high salt study. You will be discharged around 2:00 p.m. This study will determine if you are salt-sensitive. In addition, the investigators hope to learn more about the hormones that regulate your blood pressure and the genes responsible for regulating those hormones.