Oxalate <25 mg/serving
Oxalate 25-99 mg/serving
Oxalate ≥100 mg/serving
Sweet potatoes are one of the most frustrating foods for kidney stone patients. They're objectively nutritious — loaded with beta-carotene, fiber, and potassium. They're everywhere in "clean eating" circles and restaurant menus. And they have 56 mg of oxalate per half-cup serving — solidly in the Caution zone, more than double the 25 mg safe threshold. Here's the practical truth: sweet potatoes are a sometimes-food, not a daily staple. Peel them (the skin concentrates oxalate), boil them (leaches oxalate into the water), and keep portions to a reasonable half-cup. Pair with a calcium source — butter or a glass of milk — to bind some oxalate in your gut.
📊 Nutrition at a Glance
📏 Oxalate by Serving Size
| Serving | Weight | Oxalate | Verdict |
|---|---|---|---|
| 1/2 cup, mashed | 134 g | 56 mg | Caution |
| 2 x 1/2 cup, mashed | 268 g | 112 mg | Avoid |
| ½ x 1/2 cup, mashed | 67 g | 28 mg | Caution |
🏷️ Tags
🟡 See all Vegetables rated Caution for kidney stones →
⚖️ Compare this food: · vs Lettuce · vs Lettuce →
🔗 Related Foods
🟢 Safe alternatives (recommended)
⚠️ Other foods in this category to watch
❓ Frequently Asked Questions
Is Sweet potato safe for kidney stones?
You can have it. Just be aware that at 56 mg oxalate per 1/2 cup, mashed, Sweet potato isn't in the all-clear zone. Think 'sometimes food,' not 'everyday food.'
How much oxalate is in Sweet potato?
56 mg — that's the oxalate in a standard 1/2 cup, mashed of Sweet potato. For the 100g comparison freaks: 42 mg. Source is Harvard's 2024 food analysis project.
Is Sweet potato low or high oxalate?
It's in the moderate range. 56 mg per 1/2 cup, mashed sits between safe and high-risk. Manageable if you watch how much you eat.
What can I eat instead of Sweet potato?
Substitutes exist. The safe alternatives listed below are all low-oxalate foods in the same family as Sweet potato. Grab one of those and you dodge the oxalate while keeping similar flavors.
How much Sweet potato is safe to eat?
A standard serving (1/2 cup, mashed) of Sweet potato gives you 56 mg oxalate. Half that = 28 mg. That's the difference between a caution-level and a safe-level meal. Portions matter a lot here.
How much sodium does Sweet potato have?
36 mg sodium per 100g in Sweet potato. Well under the 460 mg threshold. One less thing on your kidney stone checklist.