Dates, Raisins, and Prunes
These are all dried fruits and therefore will have a higher concentration of potassium than any kidney patient should have. One cup of prunes can provide 1,274 mg of potassium, which is five times the normal amount found in their counterpart, the plum.
Leafy Green Vegetables
Including but not limited to: swiss chard, beet greens, collard greens, pumpkin, winter squash, and kale. These items all contain high amounts of potassium and should be avoided whenever possible—especially cooked. Half a cup of leafy green vegetables when cooked reduce to about one tablespoon. Eating half a cup of cooked greens will raise the potassium levels exponentially.