This super-sweet Thanksgiving staple packs a powerful potassium punch, which is why it deserves a spot at the dinner table year round. “Potassium causes the kidneys to excrete excess sodium from the body, and keeping sodium levels low can help drive down blood pressure,” Salge Blake says. Best bet: Eat them with the skin for a tasty fiber boost. Other sources of potassium: Beet greens, white beans, plain nonfat yogurt Try this: Bump up the potassium content of potato salad. Boil sweet potatoes, then combine them with chopped apple, diced celery and sliced scallions. Toss with a dressing of olive oil, cider vinegar and honey.