Phosphorus is the second most abundant mineral in the body, after calcium. About 85% of phosphorus in the body exists in bone.

Functions

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
• Being an important cell membrane component
• Being important to hemoglobin’s oxygen delivery function

Recommended Intake

Phosphorus Deficiency

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
• General weakness
• Muscle weakness
• Bone pain
• Increased susceptibility to infection
• Prickling, tingling, or numbness of the skin in the arm, hands, legs, or feet
• Loss of muscular coordination

Phosphorus Toxicity

Phosphorus toxicity is rare in people with normal kidney function. However, those with kidney problems 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.

Major Food Sources

Are you looking to add more phosphorus to your diet? Here are some good food sources: