Effect of Egg White Diets on Calcium Metabolism in the Rat

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Abstract
Increasing the egg white protein content from 18 to 36% in low phosphorus diets of rats resulted in an increased renal excretion of calcium, a decreased calcium balance and a decreased ash content of bone. The latter effects appeared only when egg white was used as the protein source. However, this effect was no longer evident with an egg white preparation from which conalbumin, lysozyme, and ovomucoid had been removed. On the other hand the increased renal excretion of calcium could be demonstrated when blood fibrin or the partially purified egg white were used as the protein source especially when vitamin D was fed. The increased renal loss of calcium in this case could be accounted for by an increased intake or absorption or both.