How and Why to Limit Phosphorus - eKidney Clinic
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How and Why to Limit Phosphorus

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Kidney Disease and Phosphorus

With kidney disease, having too much phosphorus in your body can be a real problem for your skin, joints, and bones. A dietitian can help you make a meal plan that will keep you feeling your best.

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What is Phosphorus?

It’s a mineral element and part of the “stone” foundation that holds up your body. Your bones and teeth are mostly made of phosphorus and calcium as calcium phosphate—stone!

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Phosphorus + Calcium Make Up Bones

Phosphorus is stored in your bones and teeth, along with calcium. Small amounts of each mineral are also in your blood. When your body needs them, they are removed from your bones.

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Phosphorus is an Electrolyte

In your blood, tiny but precise amounts of dissolved phosphorus help your cells talk to each other. Phosphorus is an electrolyte. It helps your body use energy from food and helps keep your blood at the right pH (acid/base) level. But, if your kidneys don’t work as well as they should, they can’t remove excess phosphorus. The phosphorus builds up in your blood.

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Calcium + Phosphorus Can Harden Blood Vessels

When your kidneys don’t work, having too much calcium and phosphorus in your blood is a problem. The two minerals can join and form deposits in your skin, causing painful itching. Or, they can form in blood vessels and may cut off blood flow to a limb. Your doctor may prescribe phosphate binders for you so your blood levels of phosphorus don’t go too high. Track your calcium and phosphorus so you know what they are.

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Know the Food Sources of Phosphorus

Phosphorus is found in MANY foods. Even foods you need to eat to stay healthy, like high-quality protein, have phosphorus. Your care team may want you to limit some foods that are high in phosphorus, like nuts, beans and peas, seeds, whole grains, dairy products, cola, chocolate, and beer. There are many other foods that are high in phosphorus.

Read more about phosphorus from the:

To learn more about protein, visit the Get the Right Amount of Protein topic.

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list of ingredients with phosphate highlighted

 

Phosphorus Can Hide—Look for It!

Phosphorus is injected into some meat and turkey. Be sure to read fresh meat labels if your care team wants you to limit phosphorus. Look for meats that don’t have phosphate or phosphorus as an added ingredient. If the letters “PHOS” are in the label, you don’t want to eat it. Some fast foods may also have phosphorus added! Ask the restaurant to be sure what you are eating.

horseshoe magnet attracting phosphorus

 

Phosphate Binders Remove Some Phosphorus

Your doctor may prescribe drugs for you called “phosphate binders.” Like a magnet, binders attract and hold phosphorus before it can get into your bloodstream. The phosphorus passes through your gut and is removed in your stool.

You take binders WITH food. With ALL food. ONLY with food. They only work if they are in your gut at the same time that food is in your gut. When you eat a snack, you’ll take a small number of binders. With a larger meal, you’ll take more binders. Your dietitian will go over your lab test results with you to see if your phosphorus level is in the target range.

Taking phosphate binders and watching what you eat go hand in hand to help you feel your best. To learn more about phosphate binders, visit the Phosphate Binders topic.

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