Top 1 in Top 15 Foods Highest in Potassium.
Surprisingly, sweet potatoes instead of bananas have the highest potassium content on the food list. A sweet potato contains up to 694 milligrams of potassium and is rich in fiber, beta-carotene, and carbohydrates, and only 131 calories. Whether baked, fried, roasted or mashed, sweet potatoes are the healthiest and most delicious food.