Potassium is an important metal for keeping your cells alive and can be found in many foods, including fruits, vegetables, and meats. Potassium is a mineral that helps maintain normal fluid balance in your body, helps control blood pressure and reduces your risk of kidney stones. Potassium is particularly high in foods like bananas, sweet potatoes, yogurt, yellow fin tuna and soy beans. Try these tips for buying foods rich in potassium in this healthy nutrition how-to video.