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Frank Greer, MD, Professor of Pediatrics at the University of Wisconsin-Madison School of Medicine and Nancy Krebs, MD, Professor of Pediatrics at the University of Colorado Health Sciences Center wrote in their Feb. 2006 paper "Optimizing Bone Health and Calcium Intakes of Infants, Children, and Adolescents," in Pediatrics:

“The largest source of dietary calcium for most persons is milk and other dairy products, which accounts for 72% of the calcium in the US food supply. Sixty-five percent of the dietary calcium intake in children in the United States is supplied by dairy products. Drinking three 8-oz glasses of milk per day will achieve the recommended adequate intake of calcium in children 4 to 8 years of age, and four 8- to 10-oz glasses of milk will provide the adequate calcium intake for adolescents… It is important to note that there is relatively little difference in the calcium content of reduced-fat dairy products compared with whole milk–derived products…

Most vegetables contain calcium, although at relatively low density. Thus, large servings are needed to equal the total intake achieved with typical servings of dairy products… Calcium supplements are another alternative source, but these products do not offer the benefits of other associated nutrients, and compliance may be a problem.”

Feb. 2006