Iron Retention in Infancy

Factors Influencing the Urinary Excretion of Calcium. I. In Normal Persons1

“…In these studies and in a study from our own laboratory (46), the diets were controlled by the addition of minerals where necessary, so that the calcium and phosphorus intakes and calcium to phosphorus ratios were held very nearly constant. Also acid-base ratios varied only slightly between the low and high protein diets in all the studies except that of McCance (59) (64). Figure 14 records mean values for urine calcium of infants, children, and adults given diets of low and high vegetable content.…”

“…Of these other factors, the increase of acid metabolites in the body, the quantity of protein ingested, the calciumphosphorus intake ratio, dietary roughage, vitamin D, and the possible effects of intake of other salts have all been discussed as factors affecting urinary calcium (56)(57)(58)(59)(60)(61)(62)(63)(64)(65)(66)(67)(68)(69)(70)(71)(72)(73). The relative importance of these factors can now be evaluated.…”

Bioavailability of Iron From Spinach Using an in Vitro/Human Caco-2 Cell Bioassay Model

“…Our results demonstrating that iron from spinach has low bioavailability supports the findings of other researchers who performed human iron absorption studies from ingested spinach and also found low iron bioavailability. Iron from spinach was not absorbed at detectable levels in infants fed pureed spinach (29)(30)(31). In an intake/excretion balance study on the absorption of iron from spinach in six young women, iron availability from cooked spinach was 13% (24).…”

Recommended dietary allowances

“…Studies of the iron requirement for children have been reported for infancy and the preschool years only. Stearns and Stinger (28) and Oldham, Schlutz, and Morse (29) showed that for infants 0.5 mg. for each kilogram is close to the minimum needed to maintain a positive balance and a good hemoglobin level.…”