Potassium is the predominant positively charged electrolyte in body cells. The flow of potassium and sodium in and out of cells maintains the normal functioning of the heart, brain, kidney and skeletal muscles. Potassium is important for muscle contraction and the rhythm of the heart. The majority of potassium in the body is stored within the cells, so small changes in the concentration of potassium in the bloodstream can have serious health consequences.
The most hydrating potassium rich foods are: cantaloupe and celery. Cantaloupe provides 29 calories and is made up of 89 percent water and is an exceptionally good fruit for supporting energy production through its efficient carbohydrate metabolism and ability to keep the blood sugar stable. Celery is considered to be a powerful electrolyte food. As little as 2 to 3 mineral-rich stalks of celery can replenish an athlete's sodium, potassium, magnesium, calcium, phosphorus, iron and zinc levels after intense exercise.
—Chrissy Wellington