Requirements for mineral elements should be expressed per unit of body weight since excess minerals are excreted by the kidney. In addition, requirements are directly proportional to growth rates: Sodium and potassium increments reflect the amount of water retained during cellular growth; calcium, phosphorus, and magnesium requirements are in proportion to bone growth and maturation. However, few countries express recommendations in terms of body weight, reflecting the lack of direct data for infants and children.
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