At least 18 years old;

Diagnosed with high blood pressure or pre-hypertension (systolic blood pressure (SBP) \> 120 mm Hg or diastolic blood pressure (DBP) \> 80 mm Hg);

Taking no more than two medications for high blood pressure;

Currently has a primary care provider;

Willing to eat all meals provided by the study for two 14-day feeding periods;

Willing to complete study measurement procedures.

Human Sodium Balance Study