Obtaining sufficient vitamin D from normal
food sources alone is not easy. For many people, overriding vitamin D-fortified
foods and, questionably, being uncovered to some daylight are indispensable for
maintaining a healthy vitamin D status. In some groups, dietary supplements
might be requisite to meet the daily need for vitamin D.Vitamin D requirements
cannot ordinarily be met by being milk alone .which provides 25 IU/L to 78 IU/L
.(The vitamin D content of human milk is related to the mother's vitamin D
status, so mothers who supplement with high doses of vitamin D may have
correspondingly high levels of this nutrient in their milk .A evaluation of
reports of dietary rickets found that a majority of cases occurred among young,
breastfed African Americans .A examination of Canadian pediatricians found the
incidence of rickets in their patients to be 2.9 per 100,000; almost all those
with rickets had been breast fed .While the sun is a potential source of
vitamin D, the AAP advises keeping infants out of direct sunlight and having
them wear caring clothing and sunscreen .As noted earlier, the AAP recommends
that exclusively and partially breastfed infants be supplemented with 400 IU of
vitamin D per day .the RDA for this nutrient during infancy. Older adults are
at increased risk of developing vitamin D deficiency in part because, as they
age, skin cannot synthesize vitamin D as competently, they are likely to spend
more time indoors, and they may have inadequate intakes of the vitamin .As many
as half of older adults in the United States with hip fractures could have
serum 25.
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