Image for patassium Potassium can be found in many foods. Abnormal blood levels of potassium can be very dangerous as they may lead to serious heart arrhythmias. Kidneys regulate the metabolism of potassium, making sure that its levels are appropriate. However, when your kidneys are not working properly, you often need to limit certain foods that can increase the potassium in your system.

Your doctor or dietitian will tell you how many milligrams (mg) of potassium you can have each day, and they will help you design a low potassium diet.

Food Sources of Potassium

Potassium is found in many foods, especially fruits and vegetables. Here are examples from the US Department of Agriculture (USDA):

FoodServing sizePotassium content (mg)
Sweet potato, baked1 potato694
Tomato paste¼ cup664
Beet greens, cooked¼ cup655
Potato, baked 1 potato610
White beans, canned, ½ cup595
Yogurt, plain, non-fat, 8 ounces579
Tomato puree½ cup549
Clams, canned3 ounces534
Prune juice¾ cup530
Carrot juice¾ cup517
Blackstrap molasses1 tablespoon498
Halibut, cooked3 ounces490
Soybeans, green, cooked½ cup485
Tuna, yellowfin, cooked3 ounces484
Lima beans, cooked½ cup484
Winter squash, cooked½ cup448
Soybeans, mature, cooked½ cup443
Cod, Pacific, cooked3 ounces439
Bananas1 medium 422
Spinach, cooked½ cup419
Tomato juice¾ cup417
Tomato sauce½ cup405
Peaches, dried, uncooked¼ cup398
Prunes, stewed½ cup398
Milk, non-fat1 cup382
Pork chop, center loin, cooked 3 ounces382
Apricots, dried, uncooked ¼ cup378
Rainbow trout, farmed, cooked 3 ounces375