“…Whether this is a transient non-steady-state phenomenon, secondary to changes in intestinal transit time, or an indirect effect mediated via higher rates of production of 1,25 (OH ) 2 vitamin D 3 and increased active intestinal absorption of calcium, requires further study. Previous studies have shown that reduction of phosphate in a diet decreases the PTH level and increases the 1,25(OH) 2 vitamin D 3 level [18][19][20][21]. Moreover, these studies revealed an increased calcium excretion in the urine, an increased intestinal calcium absorption and occasionally an increase in the total ionized serum calcium.…”