effect of Ramadan fast on the diurnal change of total calcium, parathyroid hormone and calcitonin

Calcium, parathyroid hormone, and calcitonin levels were measured at 9 a.m., 4 p.m., 9 p.m., and 4 a.m. in 9 healthy subjects observing the dawn to sunset fast of the Muslims Holy Month Ramadhan. Similar measurements were undertaken in an ordinary non- fasting day for comparison. Significant diurnal fluctuations was seen in calcium only. During fasting and non-fasting calcium peaks at 9 a.m. It also seems to be significantly lower during fasting. On the other hand, PTH is significantly higher at 9 a.m. During Ramadhan fast. No significant differences were seen in calcitonin levels between fasting and non-fasting