🟢 Safe
Oxalate <25 mg/serving
Oxalate <25 mg/serving
🟡 Caution
Oxalate 25-99 mg/serving
Oxalate 25-99 mg/serving
🔴 Avoid
Oxalate ≥100 mg/serving
Oxalate ≥100 mg/serving
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
5 mg
Oxalate / serving
Low Oxalate
135 mg
Sodium / 100g
Low Na
3.3 g
Protein / 100g
Tier 1
15 mg
Calcium / 100g
Tier 1
📏 Oxalate by Serving Size
| Serving | Weight | Oxalate | Verdict |
|---|---|---|---|
| 1/2 cup | 165 g | 5 mg | Safe |
| 2 x 1/2 cup | 330 g | 10 mg | Safe |
| ½ x 1/2 cup | 82 g | 2.5 mg | Safe |
🏷️ Tags
🟢 See all Fruits rated Safe for kidney stones →
🔗 Related Foods
🟢 Safe alternatives (recommended)
⚠️ Other foods in this category to watch
❓ Frequently Asked Questions
Should I avoid Apple if I have kidney stones?
No red flags here. Just 5 mg per 1/2 cup — well below the 25 mg danger line. You can keep Apple in your regular rotation. Data comes from Harvard (2024).
How much oxalate is in Apple?
One 1/2 cup of Apple = 5 mg oxalate. Scale it up to 100g and you're at 3 mg. Direct measurement from Harvard, 2024. About as reliable as food data gets.
Is Apple high in oxalates?
Definitely low. 5 mg oxalate per 1/2 cup. That's the green zone. No restrictions needed for this food.
What are the best low-oxalate alternatives to Apple?
Look at the 'Safe Alternatives' section right below this FAQ. Those foods are all under 25 mg oxalate per serving and in the same category as Apple. Pick from those.
How much sodium does Apple have?
135 mg sodium per 100g in Apple. Well under the 460 mg threshold. One less thing on your kidney stone checklist.
🔍 Explore More About This Food
See our detailed safety analysis for this food
Exact oxalate numbers: how much is in a serving
Low, moderate, or high oxalate? Full breakdown
How much sodium? Kidney stone risk check
📚 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.