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Writer's pictureCaroline Farrell

Vitamin D - "The Sunshine Vitamin"

Updated: Oct 10

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One of the most frequent questions I get asked is about the role of vitamins in overall health. Of all the nutrients our body needs, vitamin D holds a special place due to its unique way of being synthesised in the skin through sunlight. Often dubbed the "sunshine vitamin," vitamin D is essential for a variety of bodily functions, yet many people are deficient, especially in the UK and Ireland where sunlight can be scarce for much of the year.


What Is Vitamin D?


Vitamin D is a fat-soluble vitamin that plays a crucial role in several important bodily functions. There are two main forms: vitamin D2 (ergocalciferol), which comes from plant-based sources, and vitamin D3 (cholecalciferol), which is produced in our skin when exposed to sunlight and can also be found in certain animal-based foods.


Once in the body, vitamin D is converted by the liver and kidneys into an active form that acts much like a hormone, regulating calcium and phosphate levels. This makes it essential for bone health, but its benefits extend far beyond the skeleton.


Why Is Vitamin D Important?


  • Bone Health: Vitamin D is key to calcium absorption, helping to maintain strong bones and teeth. Without enough vitamin D, bones can become brittle, leading to conditions like osteoporosis in adults and rickets in children.

  • Immune Function: Vitamin D plays a crucial role in modulating the immune system. Research suggests it helps the body defend itself against infections like the flu, common colds, and even more serious infections. There's even some evidence linking vitamin D levels to a reduced risk of autoimmune diseases such as multiple sclerosis.

  • Mood and Mental Health: Several studies have linked low vitamin D levels to an increased risk of depression and other mood disorders. This is particularly relevant during the winter months, when less sunlight exposure can lead to seasonal affective disorder (SAD).

  • Cardiovascular Health: Some research suggests that vitamin D may help reduce the risk of heart disease by improving blood pressure regulation and overall heart function.

  • Muscle Function: Vitamin D is also crucial for muscle strength and performance. Deficiency can lead to muscle weakness and increased risk of falls, particularly in older adults.


Vitamin D Deficiency: Are You at Risk?


It's estimated that 1 in 6 adults have low vitamin D levels. The main reason is simple: there’s often not enough sunlight, especially from October to March, when the sun’s rays are too weak for our skin to synthesise enough vitamin D. Here are some groups that are particularly at risk:


  • People with darker skin: Individuals with darker skin tones, such as those of African, Caribbean, or South Asian descent, require more sunlight to produce the same amount of vitamin D as those with lighter skin.

  • People who spend a lot of time indoors: Whether due to work, lifestyle, or mobility issues, many people don’t get enough sunlight exposure.

  • Elderly people: As we age, our skin becomes less efficient at synthesising vitamin D, and the elderly are often indoors more frequently.

  • Vegans and vegetarians: Since most natural food sources of vitamin D are animal-based, those on plant-based diets can have difficulty getting enough.


How to Get Enough Vitamin D


There are three main ways to boost your vitamin D levels: sunlight, food, and supplements.


Sunlight


During the sunnier months, just 15-30 minutes of midday sun exposure on your arms, and legs can help maintain healthy vitamin D levels. However, sunscreen and clothing block the UV rays needed for vitamin D synthesis.


Diet


While it's challenging to get enough vitamin D from food alone, sources include:


  • Oily fish like salmon, mackerel, and sardines

  • Egg yolks

  • Fortified foods, such as cereals, plant milks, and some dairy products

  • Cod liver oil


Supplements


For many people, especially in the winter, vitamin D supplements are necessary. The NHS recommends a daily supplement of 10 micrograms (400 IU) of vitamin D during the autumn and winter months. Some individuals, especially those at higher risk of deficiency, may need higher doses. I often recommend testing my clients' levels before advising on a bespoke supplement regime.


Signs of Deficiency


Vitamin D deficiency often goes unnoticed, but some symptoms can give clues:


  • Fatigue and tiredness

  • Bone pain or weakness

  • Frequent illnesses or infections

  • Mood changes, such as feeling down or depressed

  • Muscle aches or cramps



Final Thoughts


Ensuring adequate vitamin D levels is vital for maintaining overall health, especially for those living in the UK and Ireland where sunlight is limited during the colder months. While some sun exposure, a balanced diet, and supplements can help most people avoid deficiency, it’s always a good idea to monitor your intake, especially if you’re in a high-risk group.


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