While it’s often overlooked as a potential cause, a large observational study looked at the relationship between vitamin D and fatigue in young women.
The study found women with blood levels lower than 20 ng/ml or 21-29 ng/ml were more likely to complain of fatigue than those with blood levels over 30 ng/ml.
Another observational study in female nurses found a strong connection between low vitamin D levels and self-reported fatigue.
The researchers also found 89 per cent of the nurses were deficient.
Who’s at risk of vitamin D deficiency?
Some people stand risk of not getting enough vitamin D from sunlight because they have very little or no sunshine exposure.
These people include people who aren’t often outdoors – for example if you’re frail or housebound – those in an institution like a care home, or people who usually wear clothes that cover up most of your skin when outdoors.
People with dark skin, for example if someone is of African, African-Caribbean or south Asian origin, may also not get enough vitamin D from sunlight.
How to avoid vitamin D deficiency
Vitamin D is found in a small number of foods, including oily fish, red meat liver, egg yolks and fortified foods.
But since it’s difficult for people to get enough vitamin D from food alone, the Department of Health recommends everyone (including pregnant and breastfeeding women) consider taking a daily supplement containing 10 micrograms of vitamin D during autumn and winter.
For people at risk of vitamin D deficiency, it’s advised you take 10 micrograms of vitamin D throughout the year.
What happens if you take too much vitamin D?
Taking too many vitamin D supplements over a long period of time can cause too much calcium to build up in the body (hypercalcaemia).
The NHS warns this can weaken the bones and damage the kidneys and the heart.
It advises: “If you choose to take vitamin D supplements, 10 micrograms a day will be enough for most people.
“Don’t take more than 100 micrograms of vitamin D a day as it could be harmful. This applies to adults, including pregnant and breastfeeding women and the elderly, and children aged 11 to 17 years.
“Children aged 1 to 10 years shouldn’t have more than 50 micrograms a day. Infants under 12 months shouldn’t have more than 25 micrograms a day.
“Some people have medical conditions that mean they may not be able to safely take as much. If in doubt, you should consult your doctor.
“If your doctor has recommended you take a different amount of vitamin D, you should follow their advice.”
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