Vitamin D helps control a lot of processes in the body and is very important for musculoskeletal health as these nutrients are needed to keep bones, teeth and muscles healthy and strong.
A severe lack of vitamin D can lead to bone problems such as rickets in children, and osteomalacia in adults. Osteomalacia occurs when bone quality deteriorates. The symptoms can come on slowly and give you pain without an injury. This can lead to broken bones, muscle pain and weakness, resulting in difficulty with stairs, getting up off the floor or standing after sitting in a low chair or a different walking pattern.
Vitamin D deficiency can also cause secondary problems with your thyroid gland, loss of bone thickness, muscle weakness and can increase your risk of falling as you age.
Good Vitamin D levels may also help in:
- Improving muscle strength
- Improving immune system
- Reducing risk of falls
- Helping to prevent depression and anxiety
- Reducing feeling tired
Everyone in the UK is at risk but some are at higher risk than others, these include people:
- Aged 65 years and over
- Who have low or no exposure to the sun, for example those who cover their skin for cultural, religious, or health reasons; who are housebound; or who are confined indoors for long periods
- Taking certain drugs
- Are pregnant or breastfeeding
- Who have darker skin pigmentation, for example people of African, African-Caribbean, or South Asian heritage
- Who struggle to absorb foods or who have had weight loss surgery, resulting in a reduced ability to absorb fat-soluble vitamin D
- With severe liver disease or end-stage chronic kidney disease (CKD)
- Over weight with a body mass index (BMI) of 30 or above
How to get Vitamin D into your system
Sunlight: During the spring/summer months, most people can get enough vitamin D through sunlight. If you have fair skin, around 20-30 minutes of sunlight on the face and forearms around the middle of the day (from 11am-3pm) 2-3 times a week is enough to make enough vitamin D in the summer months in the UK. The sunlight has to fall directly on to bare skin. If you have darker skin, you can still make some vitamin D through exposure to sunshine. However, you may not be able to make enough from sunshine and diet alone, so you should consider taking a vitamin D supplement all year round.
Too much exposure to the sun's rays can be damaging. Avoid burning as this can lead to an increased risk of skin cancer.
Supplements: There are a range of products available at supermarkets, pharmacies and other retailers; the recommended dose of vitamin D is 10 micrograms (or 400 International Units (IU)) per day. Taking more than this dose is not necessary, but if you are unable to find a vitamin D supplement providing 10 micrograms (400 IU), products providing up to 25 micrograms (1000 IU) are suitable for everyone.
Diet: Only 10% of Vitamin D is found in our diet, in either foods containing it naturally or that have been fortified.
Food sources include:
- oily fish – such as salmon, sardines,
- herring and mackerel
- red meat
- liver
- egg yolks
- fortified foods – such as some
- fat spreads and breakfast cereals
Cows' milk is generally not a good source of vitamin D because it is not fortified in the UK, as it is in some other countries.
NICE recommends that health professionals should NOT routinely test people’s vitamin D status unless they are classed as being particularly high risk or show clinical signs of deficiency.
In summary: Public Health England and NICE advise that everyone should consider taking a daily vitamin D supplement during the autumn and winter. Those at higher risk should take daily supplements, all year round.
The recommended dose of vitamin D is 10 micrograms (or 400 International Units (IU)) per day.