The Adequate Intake (AI) for vitamin D increases in older adults because
a. their ability to absorb dietary vitamin D is diminished.
b. conversion of vitamin D to its active forms is less efficient.
c. their skin is less efficient in synthesizing vitamin D during sun exposure.
d. they require more vitamin D than younger adults to maintain bone health.
C
Older adults need more dietary vitamin D because their skin is less efficient in synthesizing vi-tamin D during sun exposure. Their ability to absorb vitamin D and convert vitamin D to its ac-tive form has less effect of vitamin D needs. They do not necessarily require more total vitamin D than younger adults for bone health; they need more from foods because their skin manufactures less.
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