Question

Why do recommendations for vitamin D intake increase in later adulthood?

A. Older individuals cannot absorb this vitamin from fortified milk.
B. The rate of bone mineralization increases after age 45.
C. More vitamin D is excreted by the kidney with age.
D. Synthesis of this vitamin decreases with age.

Answer 1

The synthesis of Vitamin D decreases with age. This is due because of a fall in 7-dehydrocholesterol levels.