Winter can feel like a long season of darkness. The days grow shorter, the skies turn gray and most of us spend more time indoors than out. Our bodies notice the difference. Energy levels drop, moods shift and sleep patterns change. This isn’t simply a “feeling,” it’s a physical response to something your body genuinely needs but isn’t getting enough of — sunlight.
The Science of Winter and Vitamin D
Research shows that vitamin D levels drop significantly during the colder months. A study of residents in Alaska found that serum vitamin D levels fell below healthy thresholds from October through March — nearly half the year.1 Only about 24% of participants maintained desirable vitamin D levels during this period. This matters because vitamin D plays a vital role in keeping us healthy. Chronic deficiency has been linked to musculoskeletal disorders, cardiovascular disease, certain cancers and autoimmune conditions like type 1 diabetes and rheumatoid arthritis.2
More Than Vitamin D
The benefits of sunlight extend beyond vitamin D production. Epidemiological studies from the United Kingdom and Sweden have linked sun exposure with reduced all-cause mortality, including lower rates of cardiovascular disease and cancer.3 Sunlight triggers the release of nitric oxide from the skin, which helps lower blood pressure and improve heart health through pathways completely separate from vitamin D. Your body was designed to thrive in the light.
Get Outside Anyway
Cold weather and cloudy skies don’t have to keep you inside. Research from Sweden found that people who spent at least one hour outdoors in daylight during winter months were significantly less likely to experience depressive symptoms compared to those who spent less time outside.4 Higher exposure to daylight also showed protective effects against sleep problems. Even on overcast days, outdoor light is far more intense than indoor lighting. Bundle up, take a walk and let your body absorb what it can.
When Sunlight Isn’t Enough
For those times when natural sunlight simply isn’t available, alternatives exist. Near-infrared light therapy has shown promising results. A double-blind study found that exposure to near-infrared light during winter months improved mood, reduced drowsiness, lowered inflammatory markers and decreased resting heart rate.5 These benefits appeared specifically during winter when natural sunlight exposure was limited. Light therapy devices designed for home use can help bridge the gap when the sun cannot.
Embrace the Light
God designed our bodies to respond to light. From the very first day of creation, light was essential to life. Take care of yourself this winter by seeking out the sunshine whenever possible. Open your blinds wide, eat lunch near a window, step outside even when it’s cold and consider light therapy when days are short. Your body, mind and spirit will thank you.
