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1 Eat fewer oxalate-rich foods. 2  If you tend to form calcium oxalate stones, your doctor may recommend restricting foods rich in oxalates. 3  These include rhubarb, beets, okra, spinach, Swiss chard, sweet potatoes, nuts, tea, chocolate and soy products.
Compared with the patients on a low-calcium diet, the patients on the normal calcium, low-sodium, low-protein diet had a 50% reduction in stone risk at 5 years. In some calcium stone patients, the mechanism for the increased rate of calcium oxalate stones is the presence of hyperoxaluria. The hyperoxaluria is usually secondary to high dietary oxalate intake caused by ingestion of foods or liquids containing large quantities of oxalate.