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Electrolytes are minerals in the blood (and other body fluids) that carry an electric charge, such as sodium, potassium, and calcium. The level of electrolytes in the body, and their balance, affects the amount of water in the body, the acidity (pH) of the blood, and other important processes. Electrolytes are lost through perspiration, and replaced through drinking fluids. (For most kids, sports drinks containing electrolytes aren't necessary, and they contain unneeded calories and sugar.)

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