One of the conclusions reached as a result of the extensive study of calcium metabolism made in this laboratory1 was that young children have the best absorption of calcium when their intake of fat is at least 3.0 gm. for each kilogram, and when the amount of calcium in the diet is in the proportion of 0.03 to 0.05 gm. of calcium oxid for each gram of fat. In a recent article on the fat requirement of children,2 we have referred again to the importance of this ratio between the fat intake and the calcium metabolism. In an attempt to establish definitely the relation of the fat intake to the calcium absorption, we have recently carried out a series of metabolism experiments on normal children.
Seven healthy children, between 2 and 6 years of age, were observed. The calcium metabolism was determined while they were taking a modification