Yeah definitely stay away from foods that are high in potassium. Spiro is 'potassium-sparing', meaning it will spare it from leaving the body (though I'm sure it does, just to a lesser degree). High levels of potassium can cause muscle problems (all muscles, including in the heart). So too much potassium is potentially life-threatening. You should also drink plenty of water and take in a bit more sodium. As a diuretic, it will make you lose both a lot quicker. I think if you just watch what you eat, and check labels of things for potassium content, you'll likely be fine. I've heard orange juice is rather high in potassium but I still drink it (8 oz or less per day). Mine has 13% of the daily recommendation, so I go by that as an indicator of what's potassium-rich and try to steer away from anything that's 10% or higher. Really, if you just cut out the stuff like bananas and spinach right away, you should do fine on your blood-test.