able on the standard deviation of the requirement for selenium; the RDA is defined as equal to the EAR plus twice the CV to cover the needs of 97 to 98 percent of the individuals in the group (therefore, for selenium the RDA is 120 percent of the EAR). The calculated RDA is rounded to the nearest 5 µg.

RDA for Pregnancy

 

14–18 years

60 µg (0.76 µmol)/day of selenium

19–30 years

60 µg (0.76 µmol)/day of selenium

31–50 years

60 µg (0.76 µmol)/day of selenium

Lactation
Evidence Considered in Estimating the Average Requirement

As previously noted, human milk selenium concentration appears to be about 18 µg (0.23 µmol)/L in Canada and the United States (Levander et al., 1987; Mannan and Picciano, 1987; Shearer and Hadjimarkos, 1975; Smith et al., 1982). The average daily milk consumption in months 2 to 6 of lactation by infants is 0.78 L, so the average amount of selenium secreted in milk would be 14 µg (0.18 µmol)/day. Since most selenium in human milk is present as selenomethionine, which has a bioavailability greater than 90 percent (Thomson and Robinson, 1980), no adjustment is made for absorption. Therefore an increment of 14 µg (0.18 µmol)/day of selenium over the adult EAR is set for lactation.

Although the amount of selenium in human milk varies with the mother 's selenium intake, mean intakes as low as 4.7 µg (60 nmol)/day selenium in exclusively human milk-fed infants in Finland are not associated with selenium deficiency symptoms (Kumpulainen et al., 1983).

Selenium EAR and RDA Summary, Lactation

To estimate the EAR for lactation, 14 µg (0.18 µmol)/day of selenium is added to the EAR of 45 µg/day for the nonpregnant and nonlactating woman, giving an EAR of 59 µg (0.75 µmol)/day. No distinction is made for bioavailability or age of the mother.

EAR for Lactation

 

14–18 years

59 µg (0.75 µmol)/day of selenium

19–30 years

59 µg (0.75 µmol)/day of selenium

31–50 years

59 µg (0.75 µmol)/day of selenium



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