It might depend on the type of stone you get, but for folks who get calcium stones, according to the nephrologist I was seeing, the single most important factor in triggering stone formation is sodium intake. Sodium and calcium metabolism are closely linked and sodium intake increases calcium excretion as well as sodium excretion. Calcium intake is somewhat important as well of course, but secondary. I gave up adding salt to food -- any salt, we get enough sodium in our American diets without it -- it's amazing how quickly you lose the taste for it. And so far I enjoy the added benefit of lower blood pressure as well.