Fruits such as apples, pears, pineapples, grapes and watermelons are low in potassium. Low-potassium diet is an inevitable choice for many patients with kidney disease when they develop renal insufficiency at a later stage. As the ability of kidney to excrete potassium is limited in these patients, they are very prone to hyperkalemia. The main harm of hyperkalemia is the inhibition of cardiomyocytes, which may cause patients to develop arrhythmia or even cardiac arrest. It may also cause the patient to develop muscle aches, weakness and convulsions. So it is necessary to know some common fruits with low potassium content, they include apples, pears, pineapples and grapes. But among them, every 100g of apple contains about 119mg of potassium, 100g of pear contains about 115mg of potassium, and 100g of pineapple contains about 109mg of potassium. It should be emphasized that although these fruits are low in potassium, over-consumption of them can still lead to an excess of accumulated potassium.