Often kidney stone patients will ask if they can eat milk or soy products. In fact, in most cases, a low-calcium diet not only fails to prevent stones, but increases the incidence of kidney stones. It has been proven that the commonly implemented practice of restricting calcium in the diet not only fails to reduce, but increases the risk of kidney stone formation. A low-calcium diet promotes the absorption of intestinal oxalates and causes hyperoxaluria, which in turn promotes urinary stone formation. A low-calcium diet has been reported to be more harmful than a normal calcium diet for patients with urinary stones. However, studies have shown that calcium supplementation in postmenopausal women does not increase the risk of stone formation, and if there is a risk, it only occurs during the first few months of calcium supplementation. It is best to increase water intake during this period. Even if the kidney stones are caused by abnormal calcium metabolism, it is important to find the cause of the abnormal calcium metabolism and eliminate the cause of the abnormal calcium metabolism.