🟢 Safe
Oxalate <25 mg/serving
🟡 Caution
Oxalate 25-99 mg/serving
🔴 Avoid
Oxalate ≥100 mg/serving
🟢

Flour, Cassava

🟢 Safe — Low Oxalate
19 mg oxalate / serving
Serving: 1/4 cup (32 g) | Per 100 g: 61 mg
✓ Medically Reviewed Content reviewed by OxalateWatch Editorial Team. Based on Harvard T.H. Chan SPH oxalate data (2024) and NKF/AUA dietary guidelines.

📊 Nutrition at a Glance

19 mg
Oxalate / serving
Low Oxalate
13 mg
Sodium / 100g
Low Na
0.9 g
Protein / 100g
Tier 1
74 mg
Calcium / 100g
Tier 1

📏 Oxalate by Serving Size

ServingWeightOxalateVerdict
1/4 cup32 g19 mg Safe
2 x 1/4 cup64 g38 mg Caution
½ x 1/4 cup16 g9.5 mg Safe

🏷️ Tags

Vegetables 🟢 Oxalate Safe Low Oxalate Plant-Based

🟢 See all Vegetables rated Safe for kidney stones →

🔗 Related Foods

❓ Frequently Asked Questions

Should I avoid Flour if I have kidney stones?

Don't overthink this one. Flour has 19 mg oxalate per 1/4 cup. That's solidly safe territory for kidney stones. The number is from Harvard's latest lab work.

What's the oxalate content of Flour?

One 1/4 cup of Flour = 19 mg oxalate. Scale it up to 100g and you're at 61 mg. Direct measurement from Harvard, 2024. About as reliable as food data gets.

Is Flour high in oxalates?

Low. 19 mg per 1/4 cup puts Flour firmly in the low-oxalate category. Safe for regular eating if you're managing kidney stones.

What can I eat instead of Flour?

There are almost always safer swaps in the same food family. For Flour, check the related foods section below — the green-marked ones are your best bets. All verified by Harvard (2024).

How much sodium does Flour have?

Low sodium: 13 mg/100g. That's a non-issue for kidney stones. Just don't undo it by drowning it in salt during cooking.

🔍 Explore More About This Food

📚 Data Sources

Oxalate: Harvard T.H. Chan School of Public Health (2024) via OHF. Nutrition: USDA FoodData Central (SR Legacy 2018 & Foundation Foods).

📖 Key Scientific References

Taylor EN, Curhan GC. Oxalate intake and the risk for nephrolithiasis. J Am Soc Nephrol. 2007;18(7):2198-2204. PMID: 17538185
Borghi L, Schianchi T, Meschi T, et al. Comparison of two diets for the prevention of recurrent stones in idiopathic hypercalciuria. N Engl J Med. 2002;346(2):77-84. DOI: 10.1056/NEJMoa010369
Fink HA, Akornor JW, Garimella PS, et al. Diet, fluid, or supplements for secondary prevention of nephrolithiasis. Eur Urol. 2009;56(1):72-80. DOI: 10.1016/j.eururo.2009.03.031
Ferraro PM, Taylor EN, Gambaro G, Curhan GC. Dietary and lifestyle factors for primary prevention of nephrolithiasis. BMC Nephrol. 2020;21(1):267. PMID: 32652950
Pearle MS, Goldfarb DS, Assimos DG, et al. Medical management of kidney stones: AUA guideline. J Urol. 2014;192(2):316-324. DOI: 10.1016/j.juro.2014.05.006
Liebman M, Costa G. Effects of calcium and magnesium on urinary oxalate excretion after oxalate loads. J Urol. 2000;163(5):1565-1569. PMID: 10751889
Holmes RP, Assimos DG. The impact of dietary oxalate on kidney stone formation. Urol Res. 2004;32(5):311-316. DOI: 10.1007/s00240-004-0437-3
Lin BB, Lin ME, Huang RH, et al. Dietary treatment and fluid intake for prevention of recurrent calcium stones. PLoS One. 2021;16(4):e0250257. PMID: 33872340
This is dietary reference information, NOT medical advice. Talk to your doctor or a registered dietitian before changing your diet. Oxalate tolerance varies by person, stone type, and medication.