You know it’s in: Bananas, white potatoes
Surprising sources: Potassium is an important mineral that’s necessary for proper functioning of the heart, kidneys, and other organs, and may even help lower blood pressure. While there is no daily value for this mineral, the adequate intake for adults is 4,700mg daily—and very few of us meet that goal, studies show.
Surprisingly, a banana, the food we tend to associate most closely with potassium, falls pretty far down on the list of top sources with only 422mg. Even the often-cited white potatoes are outshined by sweet potatoes: One medium baked has 542mg.
Other top sources include non-fat yogurt, tomato puree, canned clams, and legumes such as white beans, soybeans, lima beans, lentils, and kidney beans. Just be sure to buy beans with no salt added since excess sodium can increase blood pressure, Neville says. Three ounces of halibut and yellowfin tuna also provide more than a banana does and are considered good sources.