Phosphorus is the second most abundant mineral in the body, after
calcium. About 85% of phosphorus in the body exists in bone.
Phosphorus’ functions include:
- Forming bones and teeth
- Growing, maintaining, and repairing of cells and tissues
- Synthesizing and activating proteins, such as enzymes and hormones
- Maintaining acid-base balance
- Producing, regulating, and transferring energy in the body
- Converting carbohydrates, protein, and fat into energy
- Important cell membrane component
- Important in hemoglobin’s oxygen delivery function
Recommended Dietary Allowance
|0-6 months||No RDA; Adequate Intake (AI) = 100|
|7-12 months||No RDA; AI = 275|
|19 years and older||700|
|Pregnancy and lactation, 18 years and younger||1,250|
|Pregnancy and lactation, 19 years and older||700|
Phosphorus deficiency is called hypophosphatemia. Since phosphorus is present in such a large variety of foods, dietary phosphorus deficiency is rare.
Symptoms of hypophosphatemia may include:
- Loss of appetite
- Muscle weakness
- Bone pain
and osteomalacia, which is a softening of the bones
- Increased susceptibility to infection
- Prickling, tingling, or creeping of the skin in the arm, hands, legs, or feet
- Loss of muscular coordination
Phosphorus toxicity is rare in people with normal kidney function. However, those with
may experience hyperphosphatemia, or elevated levels of phosphorus in the blood. Hyperphosphatemia can result in decreased levels of calcium in the blood and overproduction of parathyroid hormone, which can lead to bone loss.
The following table shows the upper intake levels for phosphorus. But, it's important to note that these levels are not created for people with kidney disease. If you have problems with your kidneys and are concerned about your phosphorus intake, talk to your doctor.
Tolerable Upper Intake Level (UL)|
|0-12 months||This amount has not been established.|
|70 years and older||3,000|
|Pregnancy and lactation||3,500 and 4,000|
Are you looking to add more phosphorus to your diet? Here are some good food sources:
|Skim milk||8 ounces (227 grams)||247|
|Plain, nonfat yogurt||8 ounces (227 grams)||385|
|Part-skim mozzarella cheese||1 ounce (28 grams)||131|
|Egg ||1 large||104|
|Beef||3 ounces (85 grams)||173|
|Chicken ||3 ounces (85 grams)||155|
|Turkey||3 ounces (85 grams)||173|
|Fish (halibut)||3 ounces (85 grams)||242|
|Fish (salmon)||3 ounces (85 grams)||252|
|Almonds||1 ounce (28 grams)||134|
|Peanuts||1 ounce (28 grams)||107|
|Lentils||4 ounces (113 grams)||178|
Block GA, Port FK. Re-evaluation of risks associated with hyperphosphatemia and hyperparathyroidism in dialysis patients: Recommendations for a change in management.
Am J Kidney Dis. 2000;3596:1226-1237.
Cannata-Andia JB, Rodriguez-Garcia M. Hyperphosphataemia as a cardiovascular risk factor-how to manage the problem.
Nephrol Dial Transplant. 2002; 11:16-19.
Phosphorus. Oregon State University, Linus Pauling Institute website. Available at: . Updated August 2007. Accessed April 5, 2013.
Phosphorus. Vita Guide website. Available at: . Accessed April 5, 2013.
Last reviewed April 2013 by Brian Randall, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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