Potassium

Maintains fluid balance in the body, along with sodium. Promotes carbohydrate and protein metabolism, nerve stimulation, muscle contraction, and reduced hypertension.

Found in bananas, cantaloupes, grapefruit, tomato and orange juice, honeydew, melons, prunes, potatoes, molasses, dairy products, fish, meat, and poultry.

Signs of deficiency are drowsiness, anxiousness, nausea, weakness, and irregular heartbeat.