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Is Celery Safe for Kidney Stones? (Caution)

Celery sits in the Caution zone: 30 mg oxalate per 1 cup — above the 25 mg safe threshold but below the 100 mg avoid line. It's not a 'never' food, but it's a 'know your portion' food. The difference between a small serving and a large one is the difference between safe and pushing your oxalate budget.
✓ Lab-Verified Data Based on Harvard T.H. Chan SPH oxalate data (2024) and NKF/AUA dietary guidelines.
30
mg oxalate
per serving
Food: Celery, raw, stem only, diced
Serving: 1 cup (120 g)
Verdict: 🟡 Caution
Per 100g: 25 mg
Data: Harvard T.H. Chan SPH (2024)
🔄 Lower-Oxalate Alternatives
🟢 Garlic
0 mg / serving
🟢 Kombu Seaweed
0 mg / serving
🟢 Wakame Seaweed
0 mg / serving
🟢 Passion Fruit or Granadilla
0 mg / serving
💡 What This Means for Your Diet

The bottom line for Celery: Caution (🟡) at 30 mg oxalate per serving. It's the middle of the road — usable, but with guardrails. Half portions, occasional frequency, calcium pairing, and watching your total daily intake keeps it workable.

📊 Celery vs. Other Vegetables

Putting Celery in context: it lands close to the category average of 27 mg. In the database, 80% of vegetables (219 of 271) fall in the 🟢 Safe group (under 25 mg oxalate/serving). The typical vegetables here averages 27 mg oxalate per serving, so Celery runs 11% above that baseline. That places it near the middle of the pack in its category. Why this matters: the gap between two Safe foods can be wide — one may hold 5 mg oxalate while another sits at 24 mg. The lower one leaves more room in your day. See all vegetables rated Caution for a full side-by-side.

❓ Related Questions

Why does the safe threshold matter?

The 25 mg cutoff comes from clinical guidance for stone formers. Below it, a food's oxalate contribution is small enough not to move the needle for most patients. Harvard's 2024 lab data sits behind these figures — direct measurements, not estimates. For Celery, the measured oxalate value is 30 mg per 1 cup (Caution).

Can I eat this food every day?

Daily eating is fine for Safe foods (under 25 mg/serving). For Caution or Avoid foods, spread them out and alternate with low-oxalate picks. The idea is keeping your weekly oxalate load manageable, not eliminating any single food. For context, Celery measures 30 mg per 1 cup, rated Caution.

Where does the oxalate data come from?

Harvard T.H. Chan School of Public Health (2024) via the OHF database. These are direct laboratory measurements — the most reliable oxalate data available for food. For context, Celery measures 30 mg per 1 cup, rated Caution.

Should I also check sodium and calcium?

Yes — kidney stone risk isn't just about oxalate. High sodium increases urinary calcium (a stone promoter). Adequate dietary calcium (from food, not supplements) actually binds oxalate in your gut. Check the food's full nutrition page for the complete picture. Applied to Celery: 30 mg oxalate per 1 cup — Caution per Harvard (2024).

Celery full page 🟢 Safe foods Caution foods
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.