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Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline (1998)
Institute of Medicine (IOM)

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. "N Estimation of the Period Covered by Vitamin B12 Stores." Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline. Washington, DC: The National Academies Press, 1998.

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DRI Dietary Reference Intakes: For Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline

TABLE N-2 Time in Days until Vitamin B12 Threshold Is Reached

 

Turnover Rate

Ratio of Initial Stores to Threshold, from Table N-1

0.1

0.15

0.2

70

4,248

2,832

2,124

60

4,094

2,730

2,047

50

3,912

2,608

1,956

40

3,689

2,459

1,844

30

3,401

2,267

1,701

20

2,996

1,997

1,498

17

2,833

1,889

1,417

16

2,773

1,848

1,386

15

2,708

1,805

1,354

14

2,639

1,759

1,320

13

2,565

1,710

1,282

12

2,485

1,657

1,242

11

2,398

1,599

1,199

10

2,303

1,535

1,151

9

2,197

1,465

1,099

8

2,079

1,386

1,040

7

1,946

1,297

973

6

1,792

1,195

896

5

1,609

1,073

805

4

1,386

924

693

3

1,099

732

549
Page
529
Front Matter (R1-R24)
Summary (1-16)
1 Introduction to Dietary Reference Intakes (17-26)
2 The B Vitamins and Choline: Overview and Methods (27-40)
3 A Model for the Development of Tolerable Upper Intake Levels (41-57)
4 Thiamin (58-86)
5 Riboflavin (87-122)
6 Niacin (123-149)
7 Vitamin B6 (150-195)
8 Folate (196-305)
9 Vitamin B12 (306-356)
10 Pantothenic Acid (357-373)
11 Biotin (374-389)
12 Choline (390-422)
13 Uses of Dietary Reference Intakes (423-436)
14 A Research Agenda (437-442)
A Origin and Framework of the Development of Dietary Reference Intakes (443-447)
B Acknowledgments (448-450)
C Système International d'Unités (451-452)
D Search Strategies (453-455)
E Methodological Problems Associated with Laboratory Values and Food Composition Data for B Vitamins (456-459)
F Dietary Intake Data from the Boston Nutritional Status Survey, 1981–1984 (460-465)
G Dietary Intake Data from the Continuing Survey of Food Intakes by Individuals (CSFII), 1994–1995 (466-477)
H Dietary Intake Data from the Third National Health and Nutrition Examination Survey (NHANES III), 1988–1994 (478-501)
I Daily Intakes of B Vitamins by Canadian Men and Women, 1990, 1993 (502-506)
J Options for Dealing with Uncertainties in Developing Tolerable Upper Intake Levels (507-511)
K Blood Concentrations of Folate and Vitamin B12 from the Third National Health and Nutrition Examination Survey (NHANES III), 1988–1994 (512-519)
L Methylenetetrahydrofolate Reductase (520-522)
M Evidence from Animal Studies on the Etiology of Neural Tube Defects (523-526)
N Estimation of the Period Covered by Vitamin B12 Stores (527-530)
O Biographical Sketches (531-536)
P Glossary and Abbreviations (537-540)
Index (541-567)