Preparing food to reduce potassium

Cooking in water

Cut potatoes or vegetables into small pieces, cook in plenty of unsalted water and discard the cooking water. The Arabic guide emphasises boiling rather than relying on soaking alone.

Soaking is not enough on its own

Soaking may help with some foods, but does not guarantee a large reduction. For potatoes in particular, the guide emphasises cutting followed by cooking in water.

Canned and frozen foods

Drain canned foods and rinse the contents. Freezing alone does not guarantee lower potassium; thawing, draining and then cooking may be useful where appropriate.

Drinks and milk

The original guide describes one part juice to three or four parts water, and mentions a milk substitute of one part cream to two or three parts water. These ratios are retained for completeness, not prescribed as substitutes. Diluting does not remove potassium from the original amount of juice; it lowers its concentration and increases total fluid. Fat, calories, protein and the fluid allowance need individual review. The original booklet supporting the cream mixture cannot be confirmed here.

Potassium-containing salt substitutes

Salt substitutes often contain potassium chloride. Check the label and avoid them unless approved by the kidney team. Look for additives with “potassium” in their name.

Meat and sausages

Boiling or cooking in water may remove some potassium. Use plenty of water and discard the broth if the renal dietitian recommends this method. Do not use sausage cooking water, as advised in the original guide.

Sources and evidence

Evidence context: KDOQI 2020 is the dialysis-relevant nutrition guideline cited here; its potassium statement is expert opinion. KDIGO 2024 discusses individualised management in CKD G3–G5 and is not a dialysis-specific intake prescription. The 2021 preparation review synthesises heterogeneous food-preparation studies, not a trial proving a fixed clinical benefit in every dialysis patient.

• KDOQI 2020 — Nutrition in CKD, 6.4.1
• KDIGO 2024 — CKD, 3.11.5
• NKF — Hemodialysis and Your Diet
• 2021 — Potassium reduction by preparation technique