The amount of calcium in the body changes with age. According to the Dietary Reference Intakes for Japanese(2015), the required amount of calcium is calculated by a factor addition method in consideration of the amount of calcium accumulated in the body, the amount excreted in urine, and percutaneous losses. At that time, the calcium absorption rate becomes a very important factor. Numerical values are set so as to increase the amount of calcium in the body during the growth phase in order to maintain the calcium content in the body after adulthood. Based on the available evidence, the calcium intake level of Japanese is low and needs to be increased.
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