There are various types of urinary stones, and most of the common kidney stones are mainly composed of calcium salts. In order to reduce the chance of recurrence, dietary control is very important. The following points should be noted in the dietary care: 1. Increase the intake of calcium Many people will have questions about why they should eat more calcium instead of calcium salts in the stones. According to research, sufficient calcium will be combined with oxalic acid and excreted in the feces, thus reducing the absorption of calcium in the intestine, which will of course reduce the chance of stone formation. Therefore, drinking more milk does not increase the chance of stones, but helps to reduce the chance of stones. 2.Reduce the intake of oxalic acid Spinach, tea and other foods that contain more oxalic acid should be reduced. 3.Reduce sodium intake. Eat a light diet and minimize canned and processed foods. Eat more potassium-containing foods, such as bananas and other foods. 4.Reduce the intake of meat Reduce the intake of animal protein, can reduce the chance of forming stones. 5.Drink more water and exercise Drinking more water can speed up the metabolism of salts in the urine, so drink at least 3000 C.C. of water every day. Exercise more can reduce the loss of bone calcium, and thus reduce the production of stones.