Why This Blog?
This blog started with a very simple question: why aren’t people taking Vitamin D supplementation? The importance of Vitamin D is well known scientifically, Vitamin D is widely available as a supplement, it is relatively inexpensive and yet according to the most recent research, over 40% of the population is still Vitamin D deficient.
As winter sets in with its shorter days and colder temperatures, many people start to feel “off”. It could be a dip in energy, a struggle with mental health, or a higher frequency of colds and flus. What is not widely known is that all of these are linked to the levels of circulating Vitamin D.
In this blog, we’ll explore the importance of Vitamin D in winter, explaining what Vitamin D is and why it’s crucial for your health during the colder months. We’ll discuss how winter impacts its production, identify the symptoms of deficiency, and tips on how to get Vitamin D in winter to stay healthy, and in great spirits all season long.
If you’re short on time, here are the key takeaways:
- Vitamin D is a critical, but often-overlooked component of overall wellness
- Vitamin D plays a crucial role in mood regulation (wards off depression!), immune support (fights off colds and flus!), muscle function and bone health (keeps things strong!)
- Vitamin D levels are not routinely included in a standard blood test, but can easily be added
- Talk to your healthcare provider and get your Vitamin D levels tested to understand your baseline
- If you are Vitamin D deficient there are a number of different avenues you can pursue including diet, supplementation and light therapy
What is Vitamin D?
Vitamin D is a fat-soluble vitamin that plays a critical role in several important bodily functions. Unlike most vitamins, Vitamin D is unique in that it can be synthesized by your body when your skin is exposed to sunlight. The ultraviolet B (UVB) rays from the sun trigger the production of Vitamin D in the skin. During the winter months, reduced sunlight, shorter days and reduced levels of UVB can lower the amount of Vitamin D your body produces, leaving many people deficient.
Vitamin D is essential for:
- Immune Support: It helps activate your body’s defenses against pathogens, reducing your risk of illness.
- Mood Regulation: There is evidence to suggest that Vitamin D plays a role in serotonin production, which helps regulate mood and mental well-being.
- Muscle Function: Vitamin D is important for maintaining normal muscle function, especially in winter when physical activity may decrease.
- Bone Health: It aids calcium absorption, helping to maintain strong bones and teeth. Without enough Vitamin D, your bones can become brittle and prone to fractures.
Why Is Vitamin D Production Reduced During The Winter?
As the days grow shorter and the weather turns colder, the body faces unique challenges in producing sufficient Vitamin D. In fact, it becomes much harder to get the necessary amount of Vitamin D from sunlight alone, particularly in regions farther from the equator.
During the winter months, the angle of the sun is lower in the sky, and its rays are less direct. This means that even if you are outdoors, the sun’s rays may not be strong enough to stimulate significant Vitamin D production in your skin. In addition, many people tend to spend more time indoors during the colder months, limiting exposure to sunlight even further. The shorter daylight hours mean you have less time to be exposed to sunlight, even when it is available.
What Are The Symptoms of Vitamin D Deficiency?
When your body lacks sufficient Vitamin D, several symptoms may arise. Common signs include:
- Fatigue and Weakness: You may feel unusually tired, even after a full night’s sleep. Muscle weakness is also common, which can make everyday tasks feel more strenuous.
- Increased Risk of Illness: A weakened immune system, due to low Vitamin D, makes you more susceptible to infections, colds, and the flu.
- Depressed Mood: Since Vitamin D is linked to serotonin production, low levels can contribute to depression, especially in the winter when sunlight is scarce.
- Bone and Joint Pain: Vitamin D is critical for calcium absorption, and without it, your bones can become painful and more prone to fractures.
How Much Vitamin D Do You Need?
The amount of Vitamin D required varies based on age, location and lifestyle, but general guidelines from health authorities suggest anywhere between 400 and 800 international units (IU) / day. That said, the actual amount needed is going to vary significantly between individuals based on their exposure to sunlight, skin tone, diet and exercise patterns. People living in northern latitudes may need to increase their Vitamin D intake to levels of 2,000 IU / day, 5,000 units / day or even more!
The most effective way to determine if you need more Vitamin D is by testing your levels, especially if you’re experiencing symptoms of deficiency.
How to Get Vitamin D in Winter?
The importance of Vitamin D in winter cannot be overstated, as it plays a key role in supporting immunity, energy levels, and mood. Here are several ways to ensure you meet your daily needs during the colder months.
- Eat Vitamin D-Rich Foods: Nutrition and your health are directly related. While food alone may not provide all the Vitamin D your body needs, certain foods can help supplement your intake. Some of the best food sources of Vitamin D include fatty fish, egg yolks, fortified foods (such as milk, orange juice, and breakfast cereals), cheese and beef liver.
- Take a Vitamin D Supplement: Since it can be difficult to get enough Vitamin D from food alone, supplements can be a reliable option. The most effective form of Vitamin D is Vitamin D3 (cholecalciferol), which is more readily absorbed by the body than D2. When taking a Vitamin D supplement, it’s important to consume it with fat, as Vitamin D is a fat-soluble vitamin that requires fat for proper absorption. As with any new supplement, it’s a good idea to consult with a healthcare provider before starting to ensure you’re taking the right amount for your needs.
- Spend Time Outdoors, Even in Winter: A popular question is: How to get Vitamin D from the sun? If possible, try to spend some time outside during daylight hours. Even though the sun may not be as strong, exposure to natural light can still contribute to Vitamin D production. Bundle up and take a brisk walk during your lunch break or on the weekends, when the sun is out. Exercise can also have the added benefit of boosting your mood.
- Consider Light Therapy: For those living in areas with particularly long winters and limited sunlight, light therapy boxes can be an effective tool. These devices mimic natural sunlight and can help improve mood and energy levels by stimulating the production of Vitamin D.
What’s Next?
If you’re experiencing any of the symptoms above—or are now curious about what your Vitamin D levels are, talk to your healthcare provider and get your Vitamin D levels tested!
If it turns out that you are vitamin D deficient, don’t be surprised or alarmed; remember, over 40% of the population is Vitamin D deficient, and that number will likely be higher during the winter. Instead, transform Vitamin D into one of your strongest allies through diet, supplements, or spending time outdoors.
References
Holick MF. Vitamin D deficiency. N Engl J Med. 2007 Nov 8;357(6):266-81.
Di Angelantonio E, et al. Vitamin D and risk of heart disease. Lancet. 2019.
National Institutes of Health (NIH), Vitamin D – Fact Sheet for Health Professionals. Link
