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Niacin EAR and RDA Summary, Ages 19 Years and Older

On the basis of the data in Table 6-1 and with a minor (approximately 10 percent) decrease for energy in women, the EAR is set at 12 mg/day of NEs for men and 11 mg/day of NEs for women.

EAR for Men

19–30 years

12 mg/day of niacin equivalents

 

31–50 years

12 mg/day of niacin equivalents

 

51–70 years

12 mg/day of niacin equivalents

 

> 70 years

12 mg/day of niacin equivalents

EAR for Women

19–30 years

11 mg/day of niacin equivalents

 

31–50 years

11 mg/day of niacin equivalents

 

51–70 years

11 mg/day of niacin equivalents

 

> 70 years

11 mg/day of niacin equivalents

The data in Table 6-1 also suggest a CV of the niacin requirement that is greater than 10 percent. The wide variation in the efficiency of converting tryptophan to niacin may contribute to the large apparent variation. Thus, a CV of 15 percent is used; 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 Men

19–30 years

16 mg/day of niacin equivalents

 

31–50 years

16 mg/day of niacin equivalents

 

51–70 years

16 mg/day of niacin equivalents

 

> 70 years

16 mg/day of niacin equivalents

RDA for Women

19–30 years

14 mg/day of niacin equivalents

 

31–50 years

14 mg/day of niacin equivalents

 

51–70 years

14 mg/day of niacin equivalents

 

> 70 years

14 mg/day of niacin equivalents

Pregnancy

Method Used to Estimate the Average Requirement

There is no direct evidence that would suggest a change in the niacin requirement during pregnancy. To derive the EAR for pregnant women, it is estimated that the need for niacin increases by 3 mg/day of NEs to cover increased energy utilization and growth in



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