Phosphorus regulates the bone formation and inhibits the bone resorption. It is still expected as one of anti-osteoporosis nutrients. The amounts of phosphorus intake with calcium are increasing from 1960 to 1995. Because phosphorus affects the regulation of calcium metabolism, the balance of these nutrients is important. Tuero suggested that more than 1,000 mg/day of calcium intake and more than 0.74 of Ca/P were associated with better bone mineral density (BMD) values in young women. However, there are few reports of correlations between appropriate phosphorus intake, Ca/P rate and BMD.