Which of the following is a feature of vitamin D nutrition in the elderly?
a. Most elderly receive near-RDA amounts of the vitamin.
b. Aging reduces the kidneys' ability to convert vitamin D to its active form.
c. The RDA for vitamin D in the elderly is lower due to less excretion by the kidneys.
d. Most elderly rely primarily on self-synthesis of the vitamin due to their greater time spent outdoors.
e. Elderly individuals need at least 40 micrograms per day.
ANS: B
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