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Calcium Retention in the Adult Human Male as Affected by Protein Intake¹

Department of Nutritional Sciences, University of Wisconsin, Madison, Wisconsin 53706

The effect of level of protein intake on the excretion and retention of calcium in the adult human male was studied. Nine young men given 800 mg calcium daily were fed 47, 95 and 142 g protein each for 15 days. Subjects retained an average of 12 and 1 mg calcium, respectively, when fed 47 and 95 g protein but lost 85 mg when fed 142 g. There was a highly significant difference in urinary calcium at each level of protein intake, the respective values being 217, 303 and 426 mg calcium when the subjects were fed the low, medium and high protein diet. Fecal calcium was significantly decreased as the protein intake was increased from 47 to either 95 or 142 g daily but not when it was increased from 95 to 142 g. Protein intake had no effect on serum calcium.

KEY WORDS: • calcium retention • urinary calcium • dietary protein

¹ Research supported by the College of Agricultural and Life Sciences, University of Wisconsin, Madison and by Human Nutrition Research Division, Agricultural Research Service, U. S. Department of Agriculture.

² Present address: Department of Food Science and Nutrition, Brigham Young University, Provo, Utah.

Manuscript received 29 March 1972.

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