Harnessing the Benefits of Vitamin D

As we bid farewell to the sunny, warm days and face cooler temperatures, how can we ensure we still get enough of the sunshine vitamin? Vitamin D is crucial for our health, and here are some effective ways to maintain our intake of this essential nutrient during the less sunny months.

The Importance of Vitamin D

Vitamin D is widely recognized for its role in promoting bone health. Additionally, it bolsters the immune system, supports muscle function, and facilitates communication between our brain and body through nerve signals.

Identifying a deficiency can be challenging, according to Olivia Rose, ND, director of Rose Health Clinic in Scarborough, Ontario. Symptoms can be subtle or easily disregarded, including:

• mood swings
• cognitive difficulties
• seasonal affective disorder
• skin problems such as eczema
• frequent colds or allergic reactions

“Vitamin D acts more like a prohormone than a traditional vitamin, influencing numerous bodily functions, including immune health and mental wellness,” explains Rose. “Keeping optimal levels is essential for overall health, highlighting the importance of regular checks and suitable supplementation.”

Strategies for Maintaining Vitamin D Levels as Days Get Shorter

Research indicates that supplementing significantly increases your likelihood of maintaining adequate vitamin D levels, almost quadrupling the probability, according to Statistics Canada. Furthermore, weekly fish consumption nearly doubles that chance.

Rose emphasizes the importance of consistently monitoring vitamin D levels year-round. “It’s a common myth that summer months provide enough sunlight and negate the need for supplementation,” she notes.

“Many of us spend much of the summer indoors or apply sunscreen and wear clothing that prevents vitamin D synthesis. By the time autumn arrives, many individuals find themselves deficient, heightening the risk for infections and reducing immune function.”

Factors Affecting Vitamin D Levels

When UVB rays from sunlight penetrate the skin, they convert a compound in the skin into vitamin D3. This form of vitamin D is then transported to the liver and subsequently to the kidneys, where it is transformed into calcitriol, the bioactive form of vitamin D.

Sun Exposure Considerations

Those living at higher latitudes are more susceptible to vitamin D deficiency due to reduced sunlight exposure. Factors like cloud cover, tall buildings, and trees can further obstruct sunlight. Air pollution is another issue that can limit UV rays necessary for vitamin D synthesis in the skin.

Skin Type Influences

Your skin type can affect how well vitamin D is absorbed. A study based on the Canadian Health Measures Survey indicated that race is a significant risk factor for low vitamin D levels. Another study highlighted that First Nations pregnant women in Saskatchewan had markedly lower vitamin D levels compared to their non-First Nations counterparts.

Socioeconomic Factors

Socioeconomic factors, including the privilege of vacationing in sunnier locales, a preference for shade, nutrition choices, artificial lighting, workplace attire, sunscreen use, smoking, and aging, can all influence vitamin D absorption.

Vitamin D Status in Canada

Research shows that 19% of Canadians have inadequate vitamin D levels, and the risk of deficiency doubles in winter months. Most of Canada, save for the southernmost tip of Ontario, lies above the 42nd parallel north.

This discrepancy is why Canada mandates vitamin D fortification in milk and margarine. If your diet lacks sufficient vitamin D from sources like fortified foods, salmon, tuna, or eggs, consulting a healthcare professional for appropriate supplements is advisable.

This article was originally published in the September 2025 issue of alive magazine.