Oxalate <25 mg/serving
Oxalate 25-99 mg/serving
Oxalate ≥100 mg/serving
Diet cola and other diet sodas are zero oxalate. The phosphoric acid in colas has been flagged in some studies as potentially increasing stone risk by altering urine chemistry, but the evidence is mixed and weak. The bigger picture: diet soda has no nutritional value, and replacing water with diet soda reduces your overall hydration quality. An occasional diet soda is fine. A six-pack-a-day habit is not — not because of oxalate, but because it's displacing water, which is what your kidneys actually need.
📊 Nutrition at a Glance
📏 Oxalate by Serving Size
| Serving | Weight | Oxalate | Verdict |
|---|---|---|---|
| 12 fl oz | 355 g | 0 mg | Safe |
| 2 x 12 fl oz | 710 g | 0 mg | Safe |
| ½ x 12 fl oz | 177 g | 0 mg | Safe |
🏷️ Tags
🟢 See all Beverages rated Safe for kidney stones →
🔗 Related Foods
🟢 Safe alternatives (recommended)
⚠️ Other foods in this category to watch
❓ Frequently Asked Questions
Is Diet cola safe for kidney stones?
It's fine. Diet cola has 0 mg of oxalate per 12 fl oz. That's low enough that kidney stone patients don't really need to worry about it. Harvard did the measuring, not us.
How much oxalate is in Diet cola?
Here are the numbers: 0 mg oxalate in one 12 fl oz of Diet cola (355g). Per 100 grams, that's 0 mg. Harvard T.H. Chan SPH did the lab work (2024) — these aren't database guesses.
Is Diet cola high in oxalates?
Definitely low. 0 mg oxalate per 12 fl oz. That's the green zone. No restrictions needed for this food.
What are the best low-oxalate alternatives to Diet cola?
Look at the 'Safe Alternatives' section right below this FAQ. Those foods are all under 25 mg oxalate per serving and in the same category as Diet cola. Pick from those.
How reliable is the data for Diet cola?
The oxalate number for Diet cola — 0 mg per serving — is from Harvard's 2024 lab analysis. That part is solid. The USDA nutrition data (sodium, protein, calcium) is still being matched — we'll update when it's available.
Is Diet cola a good drink for kidney stones?
For beverages, 0 mg oxalate per serving puts Diet cola in the safe category. Most of your daily fluids should still be water. This one's an occasional drink, not your hydration strategy.