What Is Phosphorus?
Phosphorus is a mineral, like iron or potassium. You have more of this mineral in your body than any other except calcium.
"Phosphorus" comes from the Greek word phosphorous, which means "bringer of light." In drug or supplement form, it's called phosphate.
It plays an important role in keeping you healthy, so it’s an important part of your diet. One of its main tasks is to serve as a building block for healthy teeth and bones. You may think that's calcium's job. But calcium needs phosphorus to make your teeth and bones strong.
This mineral is hard at work in every one of the trillions of cells in your body right now.
How Much Phosphorus Do I Need?
How much phosphorus you need depends on your age. (Women who are pregnant or breastfeeding need the same amount as other adults.)
- Up to 6 months: 100 milligrams
- 7 months-1 year: 275 milligrams
- 1-3 years: 460 milligrams
- 4-8 years: 500 milligrams
- 9-13 years: 1,250 milligrams
- 14-18 years: 1,250 milligrams
- 19 years and older: 700 milligrams
If you have a health issue that keeps you from getting enough phosphorus from food, your doctor can prescribe a supplement. Phosphate also treats some types of urinary tract infections and prevents calcium stones in the urinary tract.
Foods With Phosphorus
Because phosphorus is essential to all living things, including plants and animals, it's in almost everything you eat and drink.
Phosphorus is highest in these foods:
- Meats and other proteins: beef, chicken, fish, and organ meat like liver
- Milk and dairy foods: eggs, cottage cheese, and ice cream
- Beans: navy, kidney, soy, pinto, and garbanzo
- Grains: bran and wheat germ
- Nuts and seeds: almonds, cashews, peanut butter, and sunflower seeds
Manufacturers also add it to processed food, including:
Hot dogs, lunchmeat, sausage, and chicken nuggets
- Energy drinks
- Fast food
- Ready-to-eat meals
Risks of Not Getting Enough Phosphorus
It's rare to run low on it since you can find it in so many foods. But a shortage can sometimes happen, especially in cases of starvation or the eating disorder anorexia.
Antacids that contain aluminum can drain your body of phosphorus if you take them for a long time.
If you have low levels of phosphorus for a short time, you won't notice any side effects. If you have a moderate or severe case, you may not feel like eating, have muscle weakness, bone pain, or numbness or tingling in your arms and legs.
Risks of Too Much Phosphorus
When they work well, your kidneys remove extra phosphorus your body can't use.
If you have a kidney condition like chronic kidney disease, you may have high levels of phosphorus. This can cause your bones to lose calcium or calcium deposits to form in your blood vessels, eyes, heart, and lungs. If you have too much phosphorus in your body for a long period of time, your chance of a heart attack or stroke goes up.
You can also get too much phosphorus, a condition called hyperphosphatemia, if you take too much of the supplement phosphate. Side effects include diarrhea and stomach cramps. Talk to your doctor about the right balance for your body.
How Can I Control the Amount of Phosphorus I Get?
If you need to lower the amount of phosphorus in your system because of a kidney condition, start with cutting back on processed foods. Your blood absorbs almost all the added phosphorus in processed foods. You only absorb about 20%-50% of the phosphorus in natural foods like meat and beans.
If you want to know how much phosphorus a processed food contains, you might not see the word "phosphorus" on the ingredient list. Look for the syllable "phos" in additives like:
- Calcium phosphate
- Phosphoric acid
- Sodium acid pyrophosphate