Question 1

Which foods are highest in oxalate?

Accepted Answer

Spinach is the single highest common source (a half-cup cooked can exceed 700 mg). Other very-high foods include almonds, beets, rhubarb, Swiss chard, potatoes with skin, navy beans, soy, black tea, and dark chocolate in quantity. OxalWise organizes 300+ foods into low, moderate, high, and very-high bands per serving.

Question 2

How much oxalate per day is recommended for kidney stone formers?

Accepted Answer

Most clinicians suggest calcium-oxalate stone formers stay under 100 mg of oxalate per day; some set a stricter 50 mg target. The right number is individual — a 24-hour urine test and your care team decide it.

Question 3

Does boiling remove oxalate from food?

Accepted Answer

Yes. Soluble oxalate leaches into the cooking water — boiled-and-drained spinach, potatoes, beets, and legumes lose roughly a third to over half. Steaming, baking, and microwaving remove little. Boil, drain, and never reuse the water.

Question 4

Should stone formers avoid calcium?

Accepted Answer

No — normal dietary calcium taken with meals binds oxalate in the gut so less is absorbed, and cutting calcium can raise stone risk. It is the most counterintuitive, best-replicated finding in stone prevention.

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