The main reason that the adequate intake (AI)for vitamin D increases in older adults is that
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 do younger adults to maintain bone health.

Question

Quizplus · Accepted Answer

Older adults need more dietary vitamin D because their skin is less efficient in synthesizing vitamin D during sun exposure.Their ability to absorb vitamin D and convert vitamin D to its active form has less effect on vitamin D needs.They do not necessarily require more total vitamin D than do younger adults for bone health;they need more from foods because their skin manufactures less.

The Main Reason That the Adequate Intake (AI)for Vitamin D