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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.
Oxalate-Rich Foods. Since oxalates form a large percentage of kidney stonesâ compositional value, consuming oxalate-rich foods is likely to trigger stone formation in vulnerable individuals. Thus, preparations containing high quantities of rhubarb, spinach, sweet potatoes, caffeine, chocolate, Swiss chard and soy should be avoided.