Oxalate <25 mg/serving
Oxalate 25-99 mg/serving
Oxalate ≥100 mg/serving
📊 Nutrition at a Glance
⚠️ Moderate Sodium
Sardines has 414 mg sodium per 100g. While not critically high, kidney stone patients should monitor sodium intake as excess can raise urinary calcium.
📏 Moderate Animal Protein
Sardines contains animal protein (about 20g per 100g). The AUA recommends limiting non-dairy animal protein to 3 oz (palm-sized) per meal. Reference guide, not an official standard.
📏 Oxalate by Serving Size
| Serving | Weight | Oxalate | Verdict |
|---|---|---|---|
| 3 oz | 85 g | 4 mg | Safe |
| 2 x 3 oz | 170 g | 8 mg | Safe |
| ½ x 3 oz | 42 g | 2 mg | Safe |
🏷️ Tags
🟢 See all Seafood rated Safe for kidney stones →
🔗 Related Foods
🟢 Safe alternatives (recommended)
❓ Frequently Asked Questions
Should I avoid Sardines if I have kidney stones?
Yep, you're good. Sardines clocks in at 4 mg oxalate per 3 oz — way under the 25 mg cutoff. Eat it without the stress. Measured by Harvard, not guessed.
How much oxalate is in Sardines?
4 mg — that's the oxalate in a standard 3 oz of Sardines. For the 100g comparison freaks: 5 mg. Source is Harvard's 2024 food analysis project.
Is Sardines high in oxalates?
Low. 4 mg per 3 oz puts Sardines firmly in the low-oxalate category. Safe for regular eating if you're managing kidney stones.
What are the best low-oxalate alternatives to Sardines?
Substitutes exist. The safe alternatives listed below are all low-oxalate foods in the same family as Sardines. Grab one of those and you dodge the oxalate while keeping similar flavors.
Does Sardines have a lot of animal protein?
It has animal protein, which increases kidney stone risk through uric acid and calcium in urine. Not a reason to eliminate it — just a reason to watch portions. AUA says about 3 oz per meal.
How much sodium does Sardines have?
Sodium's not the issue here. Sardines has 414 mg per 100g — comfortably low. No need to worry about salt pushing extra calcium into your urine with this food.