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
Sabah M. Bakir ,
The effect of Ramadan fast on the diurnal change of total calcium, parathyroid hormone and calcitonin,
Med. J. Cairo Univ. 1994;
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