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Fish, flatfish (flounder and sole species), cooked, dry heat

Per 100 g edible portion
Meat & Protein
Higher riskOn a stage 3-4 CKD basis, Fish's Higher risk rating is driven by Phosphorus (31%), above the 30% band.

Phosphorus / Sodium / Potassium (rating basis)

Phosphorus309 mg31%
High
Sodium363 mg18%
Moderate
Potassium197 mg10%
Low

About this food

Fish (Meat & Protein). Animal proteins tend to be higher in phosphorus, and animal phosphorus absorbs at 60-80% versus 30-50% for plants. Choosing low-phosphorus proteins such as egg whites or tofu, or controlling portions of red meat, is a common CKD approach. This is the same lens used for similar items.

Nutrient insight

Fish's phosphorus (31%) is worth noting - especially with Animal source (higher absorption) as the source, since absorption differs a lot.

Other nutrients

Protein15.2 gNot rated; needs attention at stage 4-5
Fiber0 gBeneficial for CKD (core plant-based nutrient)
Sugar (total)0 gNaturally free of sugar
Alcohol0 gAlcohol-free
Purine93.1 mgModerate purineNot rated · category estimate
Oxalate1.5 mgLow oxalateNot rated · category estimate
Phosphorus source: Animal source (higher absorption) · Potassium form: Whole food

Practical tips

Worth remembering: Boiling meat first and discarding the water removes some phosphorus and potassium; prefer low-phosphorus proteins like egg whites.

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Related guides

Meat & ProteinHigher risk foodsHigh fiber foodsLow phosphorus foods

Frequently asked questions

Is Fish safe for kidney disease?

By our rating standard (CKD stage 3-4), Fish is Higher risk. Main consideration: Phosphorus at 31% of the daily limit. Data is for reference; consult your care team.

Why is Fish rated Higher risk?

Fish is rated Higher risk because Phosphorus is 31% of its limit (309 mg) - the only mineral reaching the >30% range.

How much Phosphorus is in Fish?

On a per-100 g basis, Fish contains Phosphorus 309 mg, or 31% of the 1,000 mg daily limit.

Is Fish safe on a low-potassium diet?

For a potassium-watching diet, Fish falls below the 300 mg per 100 g marker (Potassium 197 mg). The safest step is checking this against your own lab-based limit.

How does Fish compare to other meat & protein foods?

Measured against other Meat & Protein foods, Fish is more in Phosphorus (309 mg per 100 g) than the category average - data-only, never a prescription.