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Phosphorus and Your Kidneys
Phosphorus builds bones, but when kidneys fail it builds up in the blood and pulls calcium out of bone. The added phosphorus in processed food is the biggest trap.
Why it matters in kidney disease
Phosphorus is a mineral that, with calcium, builds bones and teeth. When kidneys fail, phosphorus is no longer removed efficiently and its level in the blood rises. High phosphorus pulls calcium out of the bones, weakening them, and drives calcium deposits into blood vessels, skin and other places it does not belong. It also causes itching in some people on dialysis.
There are two kinds in food, and the difference matters. Natural phosphorus in protein foods is only partly absorbed — and the phosphorus in plant foods is absorbed least of all. Added phosphorus, put into processed foods as additives and preservatives, is absorbed almost completely (National Kidney Foundation). That is why the ingredient list — looking for words containing 'PHOS' — matters as much as the food itself.
Where it hides
- Dark colas and 'pepper' sodas, bottled iced teas and drinks with phosphate additives
- Processed cheese, cheese spreads and processed meats (bacon, sausage, deli meats, hot dogs)
- Ready meals, fast food and 'enhanced' meats injected with phosphate solutions
- Milk, yogurt and custard in large amounts; organ meats and sardines
- Bran cereals, oat bran, wholegrain products in quantity
- Chocolate, cocoa and caramel; baking mixes and self-raising flour with phosphate raising agents
- Beer and ale
Practical swaps
- Cola → lemon-lime soda, ginger ale, lemonade or water (all listed by the National Kidney Foundation as lower-phosphorus drinks)
- Milk on cereal → unenriched rice milk or almond milk (check labels; some are fortified with phosphorus)
- Processed cheese → small amounts of cottage cheese or a thin slice of natural cheese less often
- Ready meals and deli meats → fresh chicken, fish, beef, eggs or pork cooked at home
- Bran cereal → corn or rice-based cereals
- Milk chocolate and caramels → sugar sweets, jelly sweets or lower-phosphorus desserts such as pound cake or sugar cookies (mind sugar if you have diabetes)
Related conditions
Related symptoms
Frequently asked questions
If phosphorus is in protein foods, should I eat less protein?
No — protein is essential, and on dialysis you need more of it, not less. The smarter targets are phosphorus additives in processed food and cola, which add phosphorus without any nutritional benefit. Fresh protein foods in the portions your dietitian advises, plus phosphate binders exactly as prescribed if you take them, control phosphorus without risking malnutrition.
How do I spot phosphorus on a label?
Look through the ingredients for anything containing 'PHOS': phosphoric acid, dicalcium phosphate, sodium phosphate, pyrophosphate and similar words. If it is in the list, that product carries added phosphorus that your body absorbs almost fully. Choosing the similar product without a PHOS ingredient is one of the easiest wins in kidney eating.
These pages are general education about eating with kidney disease, dialysis or a kidney transplant. They are not medical advice and do not replace your own care plan. Kidney diets are individual: what is right for you depends on your stage, your blood tests, your medicines and your other conditions. Always talk to your care team or renal dietitian before changing what you eat, and never stop or change a medicine because of something you read here.