Abstract
Four healty old women: three house wives (77, 76, 76 years old) and one laboratory worker (65 years old) were taken as the subjects for this experiment, whose average body weight was about 39.5kg.
Total experimental period was 18 days; from 22 Aug. to 8 Sept. 1955, and was divided into three stages of six days. The average intakes of nutrients of those subjects throghout the total period were 1750 Calories, 55gms of protein and 20gms of fat and there was no much difference among each stage. But the average daily intake of calcium from the diet was increased from 270mg in the first stage to 370mg in the 2nd and then to 470mg in the 3rd, to change the calcium balance from negative to positive by take foods of higher calcium content.
Calcium balance of three house-wives changed from negative to positive when the amount of calcium was increased, while the other one that was seemed to take usually much amount of calcium, showed negative balance through the total experimental period.
The calcium balance of the three subjects would be maintianed by the intake of 391mg and it would be 9.6mg per kg. of body weight. More-over, if the results of four subjects were concerned, it requires the additional intake of 147mg of calcium per day to maintain its positive balance, and is 12.8mg per kg of body weight.
