Oxalate reference · Potatoes and starchy vegetables
Oxalate in sweet potato
158 mg in a 1/2 cup serving, which the Oxalosis and Hyperoxaluria Foundation bands as high. That is 126 mg per 100 g, for the most representative of the 2 forms measured. It sits above 77 of the 83 foods with a page here.
What is worth knowing about sweet potato
Sweet potato is the clearest skin-on versus skin-off difference in the table: with the skin it is high, peeled it is moderate, for the same half cup. If sweet potato is a staple and oxalate is a live concern, peeling is the whole intervention.
Every preparation measured
| As listed | Band | mg per 100 g | Serving | mg per serving |
|---|---|---|---|---|
| Sweet Potato, Orange, baked, boiled, or canned without skin | moderate | 42 | 1/2 cup mashed | 56 |
| Sweet Potato, Orange, baked or boiled with or without skin | high | 126 | 1/2 cup | 158 |
Bands are per serving as the OHF lists them, so a food can be high per 100 g and low in the portion anybody eats. Turmeric and dried parsley are the clearest cases of that, and neither is a problem in a kitchen.
Lower than sweet potato, and doing the same job
Ranked by the most representative form of each, sweet potato is 3 of 3 in potatoes and starchy vegetables. These are the ones beneath it, which matters because a substitute is only useful if it does the same thing on the plate.
| Food | Band | mg per serving | Serving |
|---|---|---|---|
| Corn and polenta | low | 2 | 1/2 cup |
| Potatoes | low | 18 | 1/2 cup |
| Sweet potato (this page) | high | 158 | 1/2 cup |
Before you act on the number
A figure in a table is not a figure in your urine. Oxalate in a plant moves with variety, ripeness, soil, season and cooking — boiling leaches a good deal of it into water that is then poured away. What you absorb also depends on what was on the plate with it, because calcium eaten in the same meal binds oxalate in the gut so that it leaves in the stool instead of the urine.
There is no daily target on this site. The OHF publishes bands per serving, not an allowance, and what any one person should aim for depends on their stone chemistry and their own testing. If you have been given a number, that number wins over anything here.
Restriction is not the first move. Guideline advice for recurrent calcium oxalate stones starts with fluid, with normal calcium taken alongside meals, and with less sodium — and it recommends the fruit and vegetables a low-oxalate list tends to strip out.
All 83 foods, and the full published table · Why a low-oxalate list is the wrong tool for planning a diet · Why calcium belongs with the meal, not off the plate
