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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.
Here are five foods that can cause kidney stones because of a high oxalate content. Sweet potatoes, baked or cannedâThese vegetables which are often advised as being better for you then regular white potatoes which are very high in oxates. A half cup serving can have 26 to 99 mg of oxalates.