Foods with high potassium content include potatoes, rape, spinach, shiitake mushrooms, silver ears, fungus, seaweed, nori and bananas. These foods are high in potassium and should be reduced for kidney disease patients, especially those with hyperkalemia, but they are not inaccessible. There are ways to remove or reduce the potassium content of vegetables, such as soaking them for half an hour or boiling them for three minutes and then frying them, which can reduce the intake of potassium by 1/2 or 2/3. These methods can reduce the content of potassium in food.