Phosphorous
What is phosphorus?
Phosphorus, like potassium, is found in many foods and is important for many different functions in your body. The phosphorus that you eat is in the form of phosphates.
When you are on dialysis you will need to limit how much phosphorus (phosphates) you eat. You might need to start limiting phosphorus before starting dialysis. Ask your doctor or dietitian if you need to start limiting phosphorus.
What does phosphorus do?
Build bones and teeth
Provides energy
Comprises a part of DNA
What is phosphorus?
When your kidneys are working normally, they remove extra phosphorus in your blood. But when your kidneys are not working well, your body is not able to get rid of the extra phosphorus. Having too much phosphorus can affect the balance of other minerals in your blood. A specific balance between the amount of calcium and the amount of phosphorus is vital. If the extra phosphorus cannot be released from your body, it will build up in your blood. This buildup causes your body to pull calcium from your bones in an effort to regain that balance. If it pulls too much calcium, your bones may become brittle and weak.
High phosphorus (hyperphosphatemia)
How does high phosphorus cause damage?
Makes bones brittle
High phosphorus pulls calcium from your bones, making them weak and brittle.
Raises blood pressure
High phosphorus raises your blood pressure due to narrowed blood vessels from the calcium and phosphorus crystals.
Causes calciphylaxis
High phosphorus can lead to calciphylaxis. Calciphylaxis is a condition that consists of painful sores on the skin that can lead to infection.
Creates deposits in veins and organs
High phosphorus can cause the formation and deposit of a calcium and phosphorus structure in your veins and organs. Over time this can create bonelike crystals.
Low phosphorus (hypophosphatemia)
Having a low level of phosphorus is uncommon, but it can happen. If your phosphorus level is low, it might be because you do not have a good appetite and you are not eating enough, or you may be taking too many binders.
Talk to your doctor or dietitian about how to keep your phosphorus at the right level. There are often no symptoms of low phosphorus.
If you have severely low phosphorus (phosphorus less than 1mg/dL), you could experience respiratory failure, heart failure, seizures, and/or coma.
Phosphorus in foods
Proteins give your body the fuel it needs to have energy. We get protein from animal and plant sources. When following a lower protein plan, it is important to eat additional healthy fat to replace the lost protein calories.
Types of phosphorus
Your body absorbs phosphorus differently, depending on the type of food and whether it is natural phosphorus or added phosphorus in packaged or processed foods. It absorbs:
40% of grains
60% of meats, beans and nuts
80% of dairy
100% of added phosphorus
Foods with added phosphorus
Added phosphorus is used to preserve foods. It is commonly found in:
- Lunchmeat
- Hot dogs
- Pancake and biscuit mix
- Ranch dressing
- Fast food
- Colas
- Tea (canned or bottled)
- Powdered lemonade
- Frozen foods
- Tortillas
- Many other types of packaged foods
- Colas
Phosphorus as an additive
Because the body absorbs 100% of added phosphorus, it is very important to read the label on food items that come in a box, bag, or jar. This is also why it is always important to take your phosphate binders (medicines used to reduce the absorption of phosphates) if prescribed by your doctor, every time you eat. Phosphorus is difficult to find when looking on the food label. Go to the ingredient list to find added phosphorus and keep a list of the brands without added phosphorus to make shopping easier the next time.
A quick way to spot added phosphorus is to look for phosphates or “phos” in the ingredient list. Some examples include:
- Phosphoric acid
- Pyrophosphate polyphosphate
- Hexametaphosphate
- Dicalcium phosphate
- Ferric phosphate
- Sodium phosphate
- Monocalcium phosphate
- Aluminum phosphate
- Sodium polyphosphate
- Sodium tripolyphosphate
- Sodium polyphosphate
- Sodium tripolyphosphate
- Trisodium phosphate
- Tetrasodium phosphate
Be aware: Avoid phosphorus as an additive
Phosphorus is added to many foods to help keep the food fresher. Our bodies absorb 100% of that added phosphorus. Phosphorus additives can be found in bagged, boxed, canned, or bottled foods. When you have kidney disease, you should avoid or limit foods with these additives. Look on the ingredient list to know if the item has added phosphorus.
Be aware: Know when to take phosphorus binders
Phosphates are the form of phosphorus found in your body. Phosphates are a large molecule made of phosphorus and oxygen. The large size of this molecule makes it hard to remove during dialysis. This is why it is important to take your phosphorus binders every time you eat, or drink a powdered, canned, or bottled beverage.
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