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🟢 Zucchini VS 🟡 Eggplant

If you're trying to decide between Eggplant and Zucchini for a kidney stone diet, the numbers tell a clear story. Eggplant has 26 mg oxalate vs Zucchini's 1 mg — that's a 26x difference measured by Harvard's lab.

✓ Medically Reviewed Content reviewed by OxalateWatch editorial team. Based on Harvard T.H. Chan SPH oxalate data (2024) and NKF/AUA dietary guidelines.

⚖️ Head-to-Head Comparison

🟢
Zucchini
Safe — Low Oxalate
1 mg oxalate / serving
Serving: 1 cup sliced (113 g)
Per 100 g: 0 mg oxalate
Sodium: — | Calcium: — | Protein: —
🟡
Eggplant
Caution — Moderate Oxalate
26 mg oxalate / serving
Serving: 1/2 cup (42 g)
Per 100 g: 62 mg oxalate
Sodium: 0 mg/100g | Calcium: 11 mg/100g | Protein: 0.9 g/100g

🏆 The Verdict: Choose Zucchini

At 1 mg oxalate per serving (rated Safe), Zucchini is the clear winner over Eggplant (26 mg, Caution). The 26x difference comes from Harvard's 2024 lab measurements — this isn't an estimate or guess. Build your meals around Zucchini and use Eggplant sparingly, if at all.

🔍 Key Takeaways

**Oxalate gap:** 26 mg vs 1 mg per serving — a 26x difference. One of these is significantly easier to fit into a kidney stone diet.
**Verdicts:** Eggplant is rated **Caution (25-99 mg/serving)**; Zucchini is rated **Safe (under 25 mg/serving)**.
**Serving strategy:** If you choose Eggplant, consider a half portion or pair it with a calcium source. Zucchini can be eaten more freely.
**Cooking tip:** For either vegetable, boiling and discarding the cooking water can reduce soluble oxalate by 30-50%. Steaming or eating raw preserves more oxalate.

❓ Frequently Asked Questions

Which is better for kidney stones — Eggplant or Zucchini?

The numbers leave no doubt: Zucchini (1 mg oxalate/serving, Safe) beats Eggplant (26 mg, Caution) by a factor of 26x. For kidney stone patients, Zucchini is the pick. Eggplant is a food to approach with portion awareness.

Can I eat Eggplant and Zucchini together?

You can, but be aware of the math. Together they'd total about 27 mg oxalate — which is manageable for most people. If both are in one meal, the oxalate load adds up. Better strategy: make Zucchini the main component and use Eggplant sparingly.

How should I prepare Eggplant vs Zucchini differently?

For Eggplant, boiling and draining cuts oxalate by 30-50%. Steaming preserves more. For Zucchini, preparation method matters less — it's already low-oxalate. If you're cooking both, boil Eggplant separately and discard the water.

What are good substitutes if I want to avoid Eggplant?

Zucchini is the #1 substitute in the same category. Beyond that, look for foods with the 🟢 Safe rating in the Vegetables category — they're all under 25 mg oxalate per serving and verified by Harvard (2024).

Browse all Vegetables 🟢 Low Oxalate Foods Zucchini page Eggplant page
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.