Dietary Reference Intakes The Essential Guide to Nutrient Requirements (2006) / Chapter Skim
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TABLE 1 Dietary Reference Intakes for Riboflavin by Life Stage Group DRI values (mg/day) EARa RDAb AIc ULd males females males females Life stage group 0 through 6 mo 0.3 7 through 12 mo 0.4 1 through 3 y 0.4 0.4 0.5 0.5 4 through 8 y 0.5 0.5 0.6 0.6 9 through 13 y 0.8 0.8 0.9 0.9 14 through 18 y 1.1 0.9 1.3 1.0 19 through 30 y 1.1 0.9 1.3 1.1 31 through 50 y 1.1 0.9 1.3 1.1 51 through 70 y 1.1 0.9 1.3 1.1 > 70 y 1.1 0.9 1.3 1.1 Pregnancy £ 18 y 1.2 1.4 19 through 50 y 1.2 1.4 Lactation £ 18 y 1.3 1.6 19 through 50 y 1.3 1.6 a EAR = Estimated Average Requirement.
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From page 275... ...
PART III: RIBOFLAVIN 275 RIBOFLAVIN R iboflavin (vitamin B2) functions as a coenzyme for numerous oxidation– reduction reactions in several metabolic pathways and in energy pro duction.
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From page 276... ...
DRIs: THE ESSENTIAL GUIDE TO NUTRIENT REQUIREMENTS 276 port system. At higher levels of intake, riboflavin can be absorbed by passive diffusion.
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From page 277... ...
PART III: RIBOFLAVIN 277 19 through 70 y Excretion of riboflavin and its metabolites, blood values for riboflavin, and the erythrocyte glutathione reductase activity coefficient > 70 y Extrapolation from younger adults Pregnancy £ 18 y through 50 y Age-specific requirement + increased energy utilization and growth needs during pregnancy Lactation £ 18 y through 50 y Age-specific requirement + energy expenditure of human milk production The UL The Tolerable Upper Intake Level (UL) is the highest level of daily nutrient intake that is likely to pose no risk of adverse effects for almost all people.
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From page 278... ...
DRIs: THE ESSENTIAL GUIDE TO NUTRIENT REQUIREMENTS 278 Bioavailability Approximately 95 percent of food flavin is bioavailable, up to a maximum of about 27 mg absorbed per single meal or dose. More than 90 percent of ribofla vin is estimated to be in the form of readily digestible flavocoenzymes.
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From page 279... ...
PART III: RIBOFLAVIN 279 KEY POINTS FOR RIBOFLAVIN Riboflavin (vitamin B2) functions as a coenzyme in numerous 3 oxidation–reduction reactions in several metabolic pathways and in energy production.
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