🥛 Calcium-Rich Seafood — Protective Foods for Kidney Stones

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.

The calcium-stone story is a reversal of intuition: dietary calcium is protective, not harmful. Calcium binds oxalate in the gut, so less reaches the kidneys. The NKF and AUA guidance is to get calcium from food — roughly 1,000-1,200 mg daily — rather than from supplements taken away from meals, since supplement calcium in isolation can move risk the wrong way. This category lists the foods that deliver that protective calcium alongside their oxalate data.

Among the 4 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.