Final answer:
The formation of calcium oxalate kidney stones in cystic fibrosis is caused by the binding of ingested fat with calcium, allowing free oxalate to cause hyperoxaluria. Low-calcium diets increase the risk of kidney stones by increasing oxalate absorption. Oxalate is a strong promoter of calcium oxalate precipitation in the urine.
Step-by-step explanation:
The formation of calcium oxalate kidney stones, such as those seen in cystic fibrosis, is caused by a binding of ingested fat with calcium, which allows free oxalate to cause hyperoxaluria. Low-calcium diets increase the risk of kidney stones as the decrease in calcium intake leads to increased absorption of oxalate, which is then excreted in greater amounts in the urine. Oxalate is a strong promoter of calcium oxalate precipitation in the urine.