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DRI Dietary Reference Intakes: For Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline
RDA for Pregnancy
14–18 years
1.4 mg/day of thiamin
19–30 years
1.4 mg/day of thiamin
31–50 years
1.4 mg/day of thiamin
Lactation
Method Used to Estimate the Average Requirement
For lactating women it is assumed that 0.16 mg of thiamin is transferred in their milk each day when daily milk production is 0.78 L (see “Ages 0 through 6 Months”). To estimate the average thiamin requirement of lactating women, an additional 0.1 mg of thiamin is added to the EAR (0.9 mg/day) for the nonpregnant, nonlactating woman to cover the energy cost of milk production. Thus, the EAR for thiamin for the lactating woman is
0.9 + 0.16 + 0.1 = 1.16 ≅ 1.2 mg/day of thiamin.
Women who are breastfeeding older infants who are eating solid foods might need slightly less thiamin because of a lower volume of milk production.
Thiamin EAR and RDA Summary, Lactation
EAR for Lactation
14–18 years
1.2 mg/day of thiamin
19–30 years
1.2 mg/day of thiamin
31–50 years
1.2 mg/day of thiamin
The RDA for thiamin is set by assuming a coefficient of variation (CV) of 10 percent (see Chapter 1) because information is not available on the standard deviation of the requirement for thiamin; 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 thiamin the RDA is 120 percent of the EAR).
