People trying to follow a low-oxalate diet should consume less than 100 mg of oxalate a day. Some foods high in oxalate are cooked spinach (755 mg/serving), raw spinach (656 mg/serving), rhubarb (541 mg/serving), rice bran (281 mg/serving), buckwheat groats (133 mg/serving), and almonds (122 mg/serving).

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