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Do you feel a little gloomy and run down in the winter? It might interest you to know that the lack of sunshine during those colder months of the year doesn’t just impact our mood, it actually can impact on our physical health too. Direct sunlight acting on the skin provides the majority of our vitamin D requirement, so when there’s less sun, we make less of this essential nutrient.
The link between certain health problems and a Vitamin D deficiency has been noted through comparisons between regions with relatively low levels of sunlight, and those that enjoy more hours of sunshine. Incidence of various cancers, irritable bowel syndrome and inflammatory bowel disease have all been linked to low exposure to sunlight and a reduction in the potential of vitamin D production.
You might be deficient in vitamin D if you cover your skin, or if you spend the daylight hours indoors. For individuals living above the north latitude of 35 degrees (which is all of the United Kingdom!), the sun cannot not reach the necessary angle for UVB penetration for all of the winter months. That means that for UK residents there is no opportunity for winter vitamin D production, unless you head to warmer climes for a holiday!
Vitamin D levels are also strongly linked to mental illness, with a Swedish study showing 58 percent of people who had attempted suicide were vitamin D deficient. They concluded that testing vitamin D levels in mental health care is of vital importance.
Thankfully, vitamin D can also be consumed through dietary sources! There are certain foods that are very rich in vitamin D. Oily fish such as mackerel, salmon and tuna are not only excellent sources of vitamin D, they also contain omega-3 fats that deliver benefits to the cardiovascular system. Among the other foods that can boost your daily vitamin D intake are fortified milk, mushrooms, egg yolks, liver and fortified breakfast cereals.
Sunlight is our main provider of vitamin D, so over the winter months especially, vitamin D supplementation is recommended for adults and children in the UK.