http://www.mayoclinic.com/health/food-and-nutrition/HQ01212
Question
Low-phosphorus diet: Best for kidney disease?
Why is a low-phosphorus diet useful in managing kidney disease? What foods contain phosphorus?
Answer
from Erik P. Castle, M.D.
The kidneys help regulate the level of phosphorus in your blood. If your kidney function is impaired, eventually you'll likely have elevated phosphorus levels (hyperphosphatemia). In turn, the elevated phosphorus decreases the level of calcium in your blood, which can lead to bone disease.
Often, 800 to 1,000 milligrams (mg) of phosphorus a day is the limit for someone who has kidney disease. Most healthy adults may eat double this amount.
Nearly every food contains some phosphorus, so you can't eliminate all phosphorus from your diet. Generally foods high in protein (some meats, dairy products, beans, legumes, nuts and seeds) are higher in phosphorus. Therefore, unless you're receiving kidney dialysis, you'll be asked to eat smaller quantities of them. Whole grains also are higher in phosphorus, so choose refined ones.
The following list may help you identify which foods to select.
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