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Adaptation to a Low Calcium Intake in Reference to the Calcium Requirements of a Tropical Population

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Nutrition Department, Bacteriological Institute, Colombo, Ceylon

1. The standard allowances for the daily intake of calcium for children and adults as given by authorities in Europe and America are considered too high.

2. There is evidence of metabolic adaptation to a low calcium intake as shown by: (a) The low amounts of calcium in the urines of those on a low calcium intake, when compared with the amounts in the urines of those on a high calcium intake. (b) The high percentage of calcium retention by growing children on about 0.2 gm. of calcium daily.

3. Many skeletons of Ceylonese children and adults have been weighed, and ten of these have been analyzed for moisture and ash. The amounts of calcium in the skeleton at different ages, and the amounts of calcium per kilogram body weight have been calculated.
The amounts of calcium retained daily by children and adolescents of different ages have been calculated from this.

4. Daily standard allowances for children and adults are suggested.