Becky Kerkenbush, MS, RD-AP, said to make sure you eat plenty of potassium-rich foods. "Potassium is a mineral that helps regulate fluid balance," she told POPSUGAR. Some high-potassium foods include: bananas, oranges, kiwi, dates, potatoes, melons, avocado, acorn squash, dried peas, beans, lentils, and dried apricots.