Problem: My watson a 77 year old male is being seen for his annual physical exam. His serum level of vitamin d is 40nml/L. the NP explains that this may be due to which of the following physiologic changes in aging
A his dislikes of milk
B taste buds on the tongue not sensing taste as well
C His GI tract not absorbing dairy as it did when he was younger
D The decline in the skins ability to metabolize vitamin D