Dietary sodium (Na) intake has been known to influence urinary calcium (Ca) excretion. High Na intake has been reported to increase urinary Ca excretion and bone resorption markers, and to be associated with bone loss. In these studies, however, the effect of high Na intake is small, and also affected by other nutrients intakes such as Ca or potassium intakes. Therefore, the association of Na intake and bone health could not be studied alone, but should be studied with full consideration of its interaction with other nutrients.