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Many fruits and vegetables contain three important electrolytes -- calcium, potassium and magnesium. High-calcium fruits and vegetables include collard greens, spinach and turnip greens. Fruits and vegetables that are high in potassium include apricots, bananas, potatoes, kiwi, tomatoes and sweet potatoes.
Key Electrolytes in the Body. Body fluids (water) contain electrolytes. Electrolytes are salts of various types each of which play a critical role in physiology (function) and in athletic performance. The best known salt is so called table salt which is usually sodium chloride (NaCl).