Is Fennel Safe for Kidney Stones? | Safe

Q: Can I eat Fennel with kidney stones?

Yep, you're good. Fennel clocks in at 12 mg oxalate per 1 bulb — way under the 25 mg cutoff. Eat it without the stress. Measured by Harvard, not guessed.

Q: How much oxalate is in Fennel?

The exact figure: 12 mg of oxalate per 1 bulb of Fennel. Works out to 5 mg/100g. This is the number kidney stone patients actually need. Harvard (2024) verified.

Q: Is Fennel a high-oxalate food?

Definitely low. 12 mg oxalate per 1 bulb. That's the green zone. No restrictions needed for this food.

Q: What can I eat instead of Fennel?

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

Q: How much sodium does Fennel have?

49 mg sodium per 100g in Fennel. Well under the 460 mg threshold. One less thing on your kidney stone checklist.

🟢 Safe
Oxalate <25 mg/serving

🟡 Caution
Oxalate 25-99 mg/serving

🔴 Avoid
Oxalate ≥100 mg/serving

✓ 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

12 mg

Oxalate / serving

Low Oxalate

49 mg

Sodium / 100g

Low Na

0.9 g

Protein / 100g

Tier 1

41 mg

Calcium / 100g

Tier 1

📏 Oxalate by Serving Size

Serving	Weight	Oxalate	Verdict
1 bulb	218 g	12 mg	Safe
2 x 1 bulb	436 g	24 mg	Safe
½ x 1 bulb	109 g	6 mg	Safe

🏷️ Tags

🟢 See all Vegetables rated Safe for kidney stones →

🔗 Related Foods

❓ Frequently Asked Questions

Can I eat Fennel with kidney stones?

Yep, you're good. Fennel clocks in at 12 mg oxalate per 1 bulb — way under the 25 mg cutoff. Eat it without the stress. Measured by Harvard, not guessed.

How much oxalate is in Fennel?

The exact figure: 12 mg of oxalate per 1 bulb of Fennel. Works out to 5 mg/100g. This is the number kidney stone patients actually need. Harvard (2024) verified.

Is Fennel a high-oxalate food?

Definitely low. 12 mg oxalate per 1 bulb. That's the green zone. No restrictions needed for this food.

What can I eat instead of Fennel?

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

How much sodium does Fennel have?

49 mg sodium per 100g in Fennel. 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.

Fennel, boiled