FIGURE 5-2 Serum phosphorus concentrations in lactating and non-lactating women. The dotted lines represent the normal range for non-lactating women. The circles represent the serum phosphorus levels of lactating women (Bryne et al., 1987; Chan et al., 1982b; Cross et al., 1995a; Dobnig et al., 1995; Kalkwarf et al., 1996; Kent et al., 1990; Lopez et al., 1996; Specker et al., 1991a).

increased during lactation. Apparently, increased bone resorption and decreased urinary excretion of phosphorus (Kent et al., 1990), which occur independent of dietary intake of phosphorus or calcium, provide the necessary phosphorus for milk production. Therefore, the EAR and RDA are estimated to be similar to that obtained for nonlactating women of their respective age groups.

EAR for Lactation

 

14 through 18 years

1,055 mg (34.0 mmol)/day

19 through 30 years

580 mg (18.7 mmol)/day

31 through 50 years

580 mg (18.7 mmol)/day

RDA for Lactation

 

14 through 18 years

1,250 mg (40.3 mmol)/day

19 through 30 years

700 mg (22.6 mmol)/day

31 through 50 years

700 mg (22.6 mmol)/day



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