Dietary Reference Intakes The Essential Guide to Nutrient Requirements (2006) / Chapter Skim
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From page 224... ...
TABLE 1 Dietary Reference Intakes for Vitamin D by Life Stage Group DRI values (mg/day) AIa,b,c ULd Life stage groupe 0 through 6 mo 5 25 7 through 12 mo 5 25 1 through 3 y 5 50 4 through 8 y 5 50 9 through 13 y 5 50 14 through 18 y 5 50 19 through 30 y 5 50 31 through 50 y 5 50 51 through 70 y 10 50 > 70 y 15 50 Pregnancy £ 18 y 5 50 19 through 50 y 5 50 Lactation £ 18 y 5 50 19 through 50 y 5 50 a AI = Adequate Intake.
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PART III: VITAMIN D 225 VITAMIN D V itamin D (calciferol) is involved in bone health and is naturally found in very few foods.
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DRIs: THE ESSENTIAL GUIDE TO NUTRIENT REQUIREMENTS 226 subscript represents either vitamins D2 or D3, or both, and is biologically inert. The biologically active hormone form of vitamin D is 1,25-dihydroxyvitamin D [1,25(OH)
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PART III: VITAMIN D 227 Accurate estimates of vitamin D intakes in the United States are lacking, in part because the vitamin D composition of fortified foods highly varies and also because many surveys do not include estimates of vitamin D intake. Special Considerations Older adults: Older adults, especially those who live in northern industrialized cities of the world, are more prone to developing vitamin D deficiency.
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DRIs: THE ESSENTIAL GUIDE TO NUTRIENT REQUIREMENTS 228 intake by users of vitamin D supplements was 20 µg (800 IU)
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PART III: VITAMIN D 229 Bioavailability This information was not provided at the time the DRI values for this nutrient were set. Dietary interactions There is evidence that vitamin D may interact with certain other nutrients and dietary substances (see Table 2)
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DRIs: THE ESSENTIAL GUIDE TO NUTRIENT REQUIREMENTS 230 Special Considerations Older adults: As adults age, their ability to synthesize vitamin D in the skin significantly decreases. Adults over the age of 65 years produce four times less vitamin D in the skin compared with adults aged 20 to 30 years.
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From page 231... ...
PART III: VITAMIN D 231 There is no evidence that vitamin D obtained through sun exposure can contribute to vitamin D toxicity because there is a limit to the amount of vitamin D3 formed. Once this amount is reached, the previtamin and vitamin D3 remaining in the skin are destroyed with continued sunlight exposure.
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DRIs: THE ESSENTIAL GUIDE TO NUTRIENT REQUIREMENTS 232 KEY POINTS FOR VITAMIN D Vitamin D (calciferol) is involved in bone health.
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From page 233... ...
PART III: VITAMIN D 233 Older adults, especially those who live in northern 3 industrialized cities of the world, are more prone to developing vitamin D deficiency. There is no evidence that vitamin D obtained through sun 3 exposure can contribute to vitamin D toxicity.
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