Absorption of vitamin B12 may be decreased in older adults because of decreased
a. intestinal motility.
b. production of bile by the liver.
c. production of intrinsic factor by the sto-mach.
d. synthesis of vitamin B12 by intestinal bac-teria.
C
Older adults may produce less intrinsic factor, which may decrease vitamin B12 absorption. Vi-tamin B12 absorption is not affected by intestinal motility or bile production. Bacterial vitamin production occurs in the large intestine, after most vitamin B12 absorption has occurred, so bac-terial production is not very important.
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