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

Berries, Blackberries, fresh

🟡 Caution — Moderate
45 mg oxalate / serving
Serving: 1 cup (144 g) | Per 100 g: 31 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

45 mg
Oxalate / serving
Moderate
1 mg
Sodium / 100g
Low Na
1.5 g
Protein / 100g
Tier 1
15 mg
Calcium / 100g
Tier 1

📏 Oxalate by Serving Size

ServingWeightOxalateVerdict
1 cup144 g45 mg Caution
2 x 1 cup288 g90 mg Caution
½ x 1 cup72 g22.5 mg Safe

🏷️ Tags

🟡 Oxalate Caution Moderate Oxalate

🔗 Related Foods

❓ Frequently Asked Questions

Should I avoid Berries if I have kidney stones?

Awareness over avoidance. Berries has 45 mg oxalate per 1 cup — higher than ideal, but not panic-worthy. Smaller servings, less frequent, problem mostly solved.

How much oxalate is in Berries?

45 mg — that's the oxalate in a standard 1 cup of Berries. For the 100g comparison freaks: 31 mg. Source is Harvard's 2024 food analysis project.

Is Berries low or high oxalate?

Moderate. Berries has 45 mg oxalate per 1 cup — not high enough to panic, not low enough to ignore. Portions matter with this one.

What are the best low-oxalate alternatives to Berries?

Don't give up the whole category — just pick a safer member of it. The green foods in the related section all work as substitutes for Berries with a fraction of the oxalate.

How much Berries is safe to eat?

Think garnish, not main dish. Berries at 45 mg per 1 cup is a lot for one food. Use smaller amounts spread across meals or as a flavor accent rather than the centerpiece.

How much sodium does Berries have?

The sodium level is fine — 1 mg/100g. If all your foods looked like this on sodium, you'd be in great shape for stone prevention.

🔍 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.