Ask The Expert
April 17, 2012
As long as you are getting your calcium only through foods, you dont need to worry about dietary calcium causing kidney stones. In fact, be sure to take in food and drinks that are rich in calcium. Aim for at least 1,000 milligrams of calcium a day in your diet.
But you should avoid calcium supplements. High doses can cause kidney stones.
In addition to calcium in kidney stones, most stones also contain oxalate. Oxalate is a chemical found in some bitter tasting plants. In fact, it is the high amounts of oxalate in urine that cause calcium oxalate kidney stones to form.
Heres why diets rich in calcium help decrease formation of kidney stones. The dietary calcium binds to oxalate in the intestine. This helps lower the amount of oxalate that is absorbed. When less oxalate is absorbed, less is released in the urine. And fewer calcium oxalate stones can form.
Some good sources of calcium include:
Also, people with calcium oxalate stones should avoid oxalate-rich foods. These include: