The causes of urinary stones (including kidney, ureteral and bladder stones) are complex. In the past and even now, many people still believe that eating more calcium-rich foods or taking calcium supplements will cause urinary stones. In fact, not only does calcium supplementation not form urinary stones, but it may also reduce the chance of developing urinary stones. It is indisputable that the ingredients of stones come from the daily diet. The main components of calcium oxalate stones are calcium and oxalic acid, so some people reason that high-calcium foods should not be eaten together with foods containing high oxalic acid, in fact, oxalic acid and calcium have already combined before entering the intestinal tract, chemical reactions have occurred, generating calcium oxalate that is not absorbed by the body, the only way out of the body can not absorb calcium oxalate is through the intestinal tract out of the body, it is impossible to enter the kidneys to form stones. A new study shows that women who eat less calcium are more likely to suffer from kidney stones than women who eat more calcium-rich foods, and a 45510 male follow-up study in the United States found that the average daily intake of 1326 mg of calcium was 1/3 less than the daily intake of 516 mg of calcium, and another survey of 9173 women in the United States for 12 consecutive years also showed that people who eat and drink high calcium The researchers analyzed that the cause of kidney stones is not too much calcium, the most critical factor in the formation of calcium oxalate stones is oxalic acid rather than calcium, and limiting calcium intake not only does not solve the problem of oxalic acid, but also causes other health problems because of the reduced intake of calcium. Therefore, patients with calcium oxalate stones should not only not restrict calcium intake, but also supplement a certain amount of calcium, using the supplemented calcium to react with oxalic acid in food to produce calcium oxalate and reduce the amount of oxalic acid in the intestine; and often eat calcium-rich foods, which is an important dietary measure to reduce the occurrence of kidney stones. Therefore, the correct way to prevent the occurrence or recurrence of urinary stones is to eat less foods with high oxalic acid content, such as spinach, kale vegetables, strawberries, peanuts, walnuts, chocolate, strong tea, cola and other foods. Eat foods with high calcium content or take calcium supplements to get enough calcium to eliminate the hidden problems caused by oxalic acid and inhibit the production of calcium oxalate stones, and at the same time, ensure that the body needs calcium.