🧂 High-Sodium Seafood — Kidney Stone Risk Guide
Seafood is low in oxalate across the board, with most fish measuring under 5 mg per serving. Like meat, the consideration is the animal protein content — and for some patients, the purine load of certain fish, which matters for uric acid stones rather than calcium oxalate stones. Fatty fish add a genuine benefit in omega-3s. The practical place of seafood in a stone diet is as a portioned protein source: low oxalate, moderate protein, and a healthy fat profile.
Sodium is the hidden dial in stone prevention: excess sodium makes the kidneys excrete more calcium, and urinary calcium is a primary stone ingredient. The general target is under 2,300 mg of sodium per day, and processed and packaged foods are where sodium hides — not the saltshaker. For stone patients who also track oxalate, the two columns interact: a food can be low in oxalate but risky through sodium, which is why the full picture matters rather than a single nutrient.
Among the 3 seafood foods shown here, the list is ranked by oxalate per serving so the safest options are immediately visible — scan the top of the grid for daily staples and treat the lower entries as portion foods.
🍽️ Foods in This Category
❓ Frequently Asked Questions
Why does sodium matter for kidney stones?
High sodium intake increases calcium in urine — a direct risk factor for calcium oxalate stones. The general recommendation is under 2,300 mg sodium per day.
How do I reduce sodium in these foods?
Choose low-sodium or no-salt-added versions when available. Avoid adding table salt during cooking or at the table. Rinse canned foods to remove excess sodium.
What's a safe sodium target?
For kidney stone patients, aiming for under 2,000 mg/day is reasonable. The NKF recommends under 2,300 mg. Check individual food pages for sodium per serving.