Abstract
The effect of various levels of low protein intake on urinary calcium excretion was studied in eight young adults. The study lasted 54 days and consisted of four experimental periods, each of 10 days, during which subjects were fed four different levels of protein (0.30, 0.45, 0.60, and 0.75g/kg body weight/day) and adequate energy (45kcal/kg body weight). Average daily calcium and phosphorus intake at the four different levels of protein intake were 550, 860; 600, 866; 625, 916; 615, 930 mg respectively. Daily urine samples which were collected during the last five days of each experimental period were analysed for calcium content. Urinary calcium levels were relatively low. However, regression analysis showed a significant relationship between the level of protein intake and urinary calcium excretion. Analysis of variance also showed significant group and individual differences in urinary calcium excretion in response to changes in the level of protein intake.
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