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maternal and fetal compartments, especially during the second and third trimesters.

Niacin EAR and RDA Summary, Pregnancy

By adding 3 mg of NEs to the EAR of 11 mg of NEs for nonpregnant, nonlactating women, the EAR for pregnancy becomes 14 mg of NEs. No adjustment is made for the woman’s age.

EAR for Pregnancy

14–18 years

14 mg/day of niacin equivalents

19–30 years

14 mg/day of niacin equivalents

31–50 years

14 mg/day of niacin equivalents

The data in Table 6-1 suggest a CV for the niacin requirement that is greater than 10 percent. The wide variation in the efficiency of converting tryptophan to niacin may contribute to the larger apparent variation. Thus, a CV of 15 percent is used because information is not available on the standard deviation of the requirement for pregnant women; 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 niacin the RDA is 130 percent of the EAR).

RDA for Pregnancy

14–18 years

18 mg/day of niacin equivalents

19–30 years

18 mg/day of niacin equivalents

31–50 years

18 mg/day of niacin equivalents

Lactation

Method Used to Estimate the Average Requirement

An estimated 1.4 mg of preformed niacin is secreted daily during lactation. Added to this is a small amount (1 mg) to cover energy expenditure involved in milk production. Thus, the additional amount of niacin needed is 2.4 mg/day of NEs for women who are exclusively breastfeeding an infant.

Niacin EAR and RDA Summary, Lactation

Adding 2.4 mg of NEs to the EAR of 11 mg of NEs for non-



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