Potassium plays a crucial role in maintaining hydration as it helps regulate fluid balance in the body. It is an essential electrolyte that works in conjunction with sodium to control fluid distribution in cells, impacting overall hydration levels. Adequate potassium intake supports muscle function and prevents cramping during exercise, as it helps facilitate muscle contractions. Consuming potassium-rich foods, such as bananas, leafy greens, and sweet potatoes, is vital for maintaining optimal hydration, especially during physical activities where fluid loss occurs.