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Draft: not yet reviewed by a clinician

Use this page to prepare questions for your care team. It does not replace their advice. Your own targets and doses come from your nephrologist, diabetes team and renal dietitian.

Phosphorus

In short

Phosphorus builds bone together with calcium. Failing kidneys cannot clear it, so it starts to build up from about stage 3–4, and dialysis removes only part of it (KDOQI 2020; K/DOQI 2003). High blood phosphate pulls calcium out of bone and leads to calcium deposits in "blood vessels, lungs, eyes, and heart" (NKF). The most useful thing you can do is avoid phosphate additives in processed food, because the body absorbs almost all of them. Phosphorus is judged on your average over a week, not one meal.

Your numbers

Starting points, not your prescription

These numbers are typical starting points from guidelines. Your nephrologist, diabetes team and renal dietitian set your own numbers from your blood tests, urine output and medicines, and change them as your labs change. If your lab report or your team says something different, they win.

Typical
Blood phosphate (phosphorus) 2.5–4.5 mg/dL; your lab's range wins
A food limit is usually started when blood phosphate is above 4.6 mg/dL at stages 3–4; 5.5 mg/dL at stage 5 and on dialysis
Food, when a limit is ordered 800–1,000 mg a day, "adjusted for protein needs" on dialysis
Typical
Blood phosphate 0.81–1.45 mmol/L; your lab's range wins
A food limit is usually started when blood phosphate is above 1.49 mmol/L at stages 3–4; 1.78 mmol/L at stage 5 and on dialysis
Food, when a limit is ordered 800–1,000 mg a day, "adjusted for protein needs" on dialysis

(NKF; K/DOQI 2003, guideline 4.1.) The app's starting ceiling is 1,000 mg a day (900 mg at stage 5 before dialysis). KDOQI 2020 asks your team to adjust phosphorus to keep your blood level normal and to think about where it comes from, not only how much (KDOQI 2020, statements 6.3.1–6.3.2). See Phosphate, calcium and PTH.

Why it matters. On hemodialysis, people who ate the most phosphorus had a higher risk of death than those who ate the least (hazard ratio 2.37, highest vs lowest third) (Noori 2010).

Natural phosphorus and additives

Where it comes from How much your body absorbs
Plants (whole grains, beans, nuts) about 20–50 % (bound as phytate)
Meat, fish, eggs, dairy about 40–60 %
Phosphate additives about 90–100 %

(KDOQI 2020; Kalantar-Zadeh 2010; Noori 2010; St-Jules 2017.)

Additives are everywhere. In a study of 2,394 best-selling grocery items, 44 % had a phosphate additive, including most frozen meals, dry mixes and packaged meats. Meals made mostly from additive foods had 736 mg more phosphorus a day than the same meals made without them, close to a whole day's limit (León 2013). "Enhanced" fresh meat and poultry carried on average 28 % more phosphate for the same protein (Sherman and Mehta 2009).

Phosphorus does not have to be listed on the US Nutrition Facts label, so the ingredient list is your main tool (NKF label guide). Food databases can under-count additive phosphorus: chicken products with additives measured higher than their database values (Sullivan 2007). So the app treats any food flagged with a phosphate additive as "high" whatever its number. See Phosphate additives for the ingredient names.

Per serving (AKF phosphorus guide): low 100 mg or less, medium 101–199 mg, high 200 mg or more. Treat any "phos" ingredient as high too (NKF). The app marks a food "medium" at 101–150 mg and "high" above 150 mg.

Phosphorus-to-protein ratio. If a label lists phosphorus, under 10–12 mg of phosphorus per gram of protein is an efficient protein: egg white is under 2 mg/g and chicken breast about 7. Processed cheese, nuts, beans and colas are not (Noori 2010; Noori 2010).

Binders

Phosphate binders are tablets, chews, powders or liquids that hold on to phosphorus in your gut so it leaves in your stool. NKF says they "must be taken every time you eat, including meals and snacks" (NKF). Take them exactly as your team prescribes, and ask what to do about snacks and skipped meals (KDIGO 2017). Binders work on the food in your gut, so they only help when taken with food. Calcium-based binders count toward your calcium total (KDIGO 2017, recommendation 4.1.6).

What to do

  • Read ingredient lists and skip anything with "phos" in it (Reading food labels).
  • Choose fresh meat and poultry that is not "enhanced" or "injected" with a solution.
  • Swap dark colas and pepper sodas for clear sodas or water.
  • Cook from plain ingredients instead of boxed mixes, frozen meals and processed cheese.
  • Keep dairy to the portions your dietitian suggests: it is one of the richest natural sources.
  • If you take binders, keep some in your bag, car or desk so a meal out is never without them.
  • Look at your phosphorus over the week in the app, not one meal.
  • On dialysis, do not cut protein to save phosphorus: pick efficient proteins (egg white, chicken, fish) instead (Protein).

Examples

Food Serving Phosphorus
Egg white 2 large 10 mg
Chicken breast, roasted 3 oz 196 mg
White rice, cooked ½ cup 34 mg
Brown rice, cooked ½ cup 104 mg (plant phosphorus, less absorbed)
Milk, 2 % fat 1 cup 224 mg
Yogurt, plain, low fat 6 oz 245 mg
Cheddar cheese 1 oz 127 mg
Cream cheese 1 tbsp 16 mg
American cheese, processed (additive) 1 oz 179 mg
Cola, regular or diet (phosphoric acid) 12 oz 33–36 mg; 27–68 mg when measured (lab study)

From the app's USDA-based food list (USDA FoodData Central); see Food lists.

Swaps that cut additive phosphorus (FDC):

Instead of Phosphorus Try Phosphorus
Boxed macaroni and cheese, 1 cup (additive) 222 mg (442 mg for the kind with a cheese-sauce pouch) Pasta, 1 cup, with 1 tbsp butter and 1 tbsp grated Parmesan 106 mg
Deli turkey, 2 oz (additive) 142 mg Turkey breast you roast yourself, 2 oz 131 mg, none of it additive
Chocolate pudding cup, 4 oz (additive) 60 mg Orange sherbet, ½ cup 30 mg
Cola, 12 oz 33 mg Lemon-lime soda, 12 oz 0 mg

The milligrams look close for the turkey, but additive phosphorus is absorbed almost fully and natural phosphorus is not, so the swap matters more than the numbers suggest (Kalantar-Zadeh 2010).

In the app

The app judges phosphorus and protein on your weekly average, so one high-phosphorus dinner is balanced by the days around it. Any food flagged with a phosphate additive shows a "high" warning (architecture contract). See Targets and warnings.

Ask your care team

  1. What was my last phosphate result, and do I need a limit?
  2. Do I need a phosphate binder? With which meals and snacks, and what if I skip a meal?
  3. Are whole grains and beans OK for me, given that their phosphorus is less absorbed?
  4. How much milk, yogurt and cheese fits my plan?
  5. How often will you check phosphate, calcium and PTH?

Get help now if…

Call your care team

High phosphate rarely causes sudden symptoms; the harm builds over months. Call your team if you cannot take your binders as prescribed (they upset your stomach, cost too much or run out), or if your phosphate stays high. For urgent symptoms, see Get help now.

Sources

Not yet reviewed by a clinician. Facts and sources last checked 2026-10-06.