Transitional cells with features of both chief and oxyphil cells were detected in all age groups in this study as reported in previous works.
Even though majority of Researchers [1,5,16,17,18] agree with this view, difference of opinion are there regarding the function of oxyphil cells. Roth and Trembley stated that they are degenerate forms of chief cells without specific function.
Huaye Chen  also observed higher enzyme activity in oxyphil cells. In his immunostaining studies oxyphil cells show the potential to produce PTH, PTH related protein and calcitriol.
This itself indicates the possibility of function of oxyphil cells in old age like chief cells to produce parathyroid hormone.
(1961) (31) demonstrated a high level of activity of a wide variety of oxidative enzymes in the oxyphil cells. Munger B.
(19 5 5) (32) stated that oxyphil cells may be degenerate forms of chief cells.
More number of oxyphil cells having mitochondria in the form of eosinophilic granules and more amount of stromal fat probably leads to reduction in parathormone level in females.
Chief cells transformed into oxyphil cells resulting into less amount of parathormone leads to osteoporosis.