Is Eggplant Safe for Kidney Stones? (Caution)
mg oxalate
per serving
Serving: 1/2 cup (42 g)
Verdict: 🟡 Caution
Per 100g: 62 mg
Data: Harvard T.H. Chan SPH (2024)
In practical terms, Eggplant sits in the 25-99 mg range with 26 mg per serving, so treat it as a sometimes-food. Keep servings modest, don't stack it with other moderate-oxalate items in one day, and pair it with calcium to blunt absorption.
Among vegetables, Eggplant sits below the category average of 27 mg. For context, 219 out of 271 vegetables (80%) are rated 🟢 Safe (under 25 mg oxalate/serving). The average vegetables in our database has 27 mg oxalate per serving — which means Eggplant is 4% below the category norm. Within its specific category, Eggplant ranks near the middle of the pack. This context matters because two 'Safe' foods can have very different oxalate levels — one might have 5 mg while another has 24 mg. Both are Safe, but the first gives you more dietary flexibility. Browse all vegetables rated Caution to compare within the same verdict level.
Why does the safe threshold matter?
The 25 mg per serving threshold is based on clinical guidance for kidney stone patients. Harvard's lab data (2024) provides the most reliable oxalate measurements available — no database estimates, direct lab analysis. For context, Eggplant measures 26 mg per 1/2 cup, rated 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. Applied to Eggplant: 26 mg oxalate per 1/2 cup — Caution per Harvard (2024).
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 Eggplant, the measured oxalate value is 26 mg per 1/2 cup (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. Eggplant comes in at 26 mg oxalate per 1/2 cup (Caution) in the measured database.