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Phosphorus: function, foods, deficiency and supplements

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Phosphorus is a mineral that makes up around 1% of your body weight. Here’s what you need to know about phosphorus including foods and supplements.

Summary

1What does phosphorus do in the body?

1. It helps build bones and teeth 2. Releasing energy from food 3. Making cell membranes 4. How much phosphorus do I need? 5. Do children need...

2What are the symptoms of a phosphorus deficiency?

bone pain, bone fractures, loss of appetite, muscle weakness, fatigue, anxiety. There is also a risk of calcium deposits (calcification) in soft...

3When should I take phosphorus supplements?

As phosphorus is so widely available, your diet should provide you with the amount you need each day. However, if you think you may not get enough...

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Find out all about phosphorus, including what it does, how much you need, where to find it and who might need to supplement their diet 

Written by Jack Feeney on January 4, 2019 
Reviewed by Dr Sarah Schenker on January 29, 2019

What is phosphorus and what does it do?

After calcium, phosphorus is the most abundant mineral in your body, making up around 1% of your body weight.1 It has a number of roles in the body, and in particular, it’s crucial for:
  • energy metabolism, or in other words releasing energy from food 
  • maintaining the structure of cells 
  • building strong bones and teeth 
Phosphorus is found in a range of foods, for example fish, brown rice and oats, so most people’s diet will provide them with all they need.3 However, you can have too much of a good thing – it can be toxic in very high doses, so it’s important to limit how much you get from supplements.4 Phosphorus is available in multivitamins, or as a homeopathic remedy.

What does phosphorus do in the body?

  1. It helps build bones and teeth
    Bones and teeth are actually made of a mineral called calcium phosphate. This means our bodies need a dietary intake of phosphorus in order for it to be converted into phosphate to help form new bone cells.5
  2. Releasing energy from food
    Phosphorus – when converted to phosphate – is also an essential component of ATP (adenosine triphosphate), a store of immediate energy in our cells.
  3. Making cell membranes
    The mineral is also used to make a type of fat called ‘phospholipids’, which we need to make our cell membranes. Phospholipids help strengthen our cell membranes, while also giving the cells enough internal space for essential cell structures, like the nucleus.7,8 
  4. How much phosphorus do I need?
    Both women and men need 550mg of phosphorus each day.9 
  5. Do children need phosphorus? 
  • 1-3 years – 270mg a day
  • 4-6 years – 350mg a day
  • 7-10 years – 450mg a day
  • 11-18 years – 625mg a day for girls, and 775mg a day for boys10

Which foods are the best sources of phosphorus?

Phosphorus is found in a range of foods, including fizzy drinks and processed meats. However, healthier choices include animal sources such as:11
  • salmon 
  • yoghurt 
  • milk and cheese
  • halibut 
  • turkey and chicken 
  • beef 
  • eggs 
Phosphorus is also in the following plant foods, although the body finds it harder to absorb this mineral from plants:12 
  • legumes, like lentils and peas
  • nuts 
  • seeds 
  • wholegrains

Who is at risk of phosphorus deficiency

Phosphorus deficiency is known as hypophosphatemia, but it’s very rare because most people are able to get all the mineral they need in their diet. However, poor diets, eating disorders, alcoholism and problems absorbing phosphorus can deplete your phosphorus levels, leading to a deficiency.13

What are the symptoms of a phosphorus deficiency?

  • bone pain 
  • bone fractures 
  • loss of appetite 
  • muscle weakness 
  • fatigue 
  • anxiety14 
There is also a risk of calcium deposits (calcification) in soft tissue.15 If you think you may be deficient, ask your GP for a phosphate test to determine phosphorus levels in your blood.16

What happens if I consume too much phosphorus?

It’s more common to have too much phosphorus in the body than too little. Too much phosphorus can be toxic, so this means you should be careful about how much you get from supplements and also keep an eye on processed foods as many contain phosphate additives. Unlike natural phosphorus in unprocessed foods, phosphate additives are very easily absorbed by the body which means you can end up taking in too much. Foods with large amounts of added phosphate include:17
  • processed meats, like ham and sausages 
  • tinned fish 
  • shop-bought cakes and biscuits 
  • fizzy drinks, including cola 
At more than 1000mg of phosphorus a day, it can cause:18 
  • diarrhoea 
  • calcification inside organs and blood vessels 
  • poor absorption of other minerals, including iron and calcium 
When taken over a long period, excess doses can also upset the balance of calcium in your bones, increasing your risk of fractures19 and may be associated with kidney and heart disease.20

When should I take phosphorus supplements?

As phosphorus is so widely available, your diet should provide you with the amount you need each day. However, if you think you may not get enough phosphorus, then you could take a supplement. However, stick to 250mg or less of phosphorus a day from supplements – plus whatever you get from your diet – to avoid toxicity, according to the NHS.21

Should women take a phosphorus supplement during pregnancy?

No, there’s no need to take a phosphorus supplement during pregnancy. You can get all you need from your diet.22

What are the potential benefits of phosphorus?

Phosphorus is mainly needed for strong bones, but a 2010 study in Hypertension found it can help lower blood pressure, too.23

Disclaimer

Advice is for information only and should not replace medical care. Please check with your GP before trying any remedies.
 

Sources

  1. HSIS. Phosphorus  https://www.hsis.org/supplements-az/p
  2. European Commission. EU register on nutrition and health claims made on foods http://ec.europa.eu/food/safety/labelling_nutrition/claims/register/public/
  3. NHS. Others: vitamins and minerals https://www.nhs.uk/conditions/vitamins-and-minerals/others/
  4. https://www.nhs.uk/conditions/vitamins-and-minerals/others/
  5. Penido MG, Alon US. Phosphate homeostasis and its role in bone health https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3461213/
  6. Oregon State University. Phosphorus https://lpi.oregonstate.edu/mic/minerals/phosphorus
  7. ScienceDirect. Phosphorus https://www.sciencedirect.com/topics/neuroscience/phosphorus
  8. David H. Nguyen. Sciencing. What Structural Role Do Phospholipids Play in Cells? https://sciencing.com/structural-role-phospholipids-play-cells-16381.html
  9. Public Health England. Government Dietary Recommendations https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/618167/government_dietary_recommendations.pdf
  10. Public Health England. Government Dietary Recommendations https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/618167/government_dietary_recommendations.pdf
  11. Oregon State University. Phosphorus https://lpi.oregonstate.edu/mic/minerals/phosphorus
  12. McCarty MF. Lower bioavailability of plant-derived phosphorus https://academic.oup.com/ajcn/article/99/4/966/4637878
  13. Ashley Marcin. Healthline. Phosphorus Deficiency  https://www.healthline.com/health/phosphorus-deficiency
  14. Ashley Marcin. Healthline. Phosphorus Deficiency https://www.healthline.com/health/phosphorus-deficiency
  15. HSIS. Phosphorus https://www.hsis.org/supplements-az/p
  16. NHS. Phosphate test https://www.nhs.uk/conditions/phosphate-test
  17. Ritz E, et al. Phosphate Additives in Food – A Health Risk https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3278747/
  18. https://www.hsis.org/supplements-az/p
  19. NHS. Others: vitamins and minerals https://www.nhs.uk/conditions/vitamins-and-minerals/others/
  20. Uribarri J, Calvo MS. Dietary Phosphorus Excess: A Risk Factor in Chronic Bone, Kidney, and Cardiovascular Disease?  https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3771143
  21. NHS. Others: vitamins and minerals https://www.nhs.uk/conditions/vitamins-and-minerals/others/
  22. Ladipo OA. Nutrition in pregnancy: mineral and vitamin supplements  https://academic.oup.com/ajcn/article/72/1/280S/4729670
  23. Alonso A, et al. Dietary phosphorus, blood pressure and incidence of hypertension in the Atherosclerosis Risk in Communities (ARIC) Study and the Multi-Ethnic Study of Atherosclerosis (MESA) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2825283/
 

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