Sunlight, Vitamin D, and Skin Protection: A Balanced Approach

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With the beginning of summer, many of us are happy to be outside again. Sunlight can help regulate circadian rhythm, support mood, and contribute to vitamin D production. At the same time, ultraviolet (UV) exposure increases the risk of skin cancer, and Vermont consistently reports melanoma rates well above the national average. According to the National Cancer Institute State Cancer Profiles, Vermont's melanoma incidence rate is about 35 cases per 100,000 people, compared to about 23 per 100,000 nationally. 

With so much conflicting information available, it can sometimes sound like there are only two choices: avoid the sun or skip sun protection. In reality, the research supports a more balanced middle ground. 

Natural light exposure, especially earlier in the day, helps support the body's sleep-wake cycle and may improve alertness and mood. Sunlight also helps the skin produce vitamin D, which is important for bone health, muscle function, and immune health. Importantly, sunlight for mood and circadian rhythm does not require tanning or burning. Even shaded outdoor light exposure can help support the body's internal clock.

However, many people still do not get enough vitamin D, particularly in northern climates. Some studies estimate that roughly 35-40% of U.S. adults may have low vitamin D levels. Because Vermont's colder months (October - March) provide limited UVB exposure, some people may benefit from discussing vitamin D supplementation with their healthcare provider.

At the same time, protecting skin from UV exposure remains important. Skin damage and sunburns increase long-term skin cancer risk, especially over time. 

The good news is that these goals do not have to compete with each other. You can enjoy the benefits of being outdoors while still taking reasonable precautions:

  • Spend time outside earlier or later in the day when UV levels are lower
  • Wear hats, sunglasses, rash guards, or protective clothing for outdoor periods
  • Use sunscreen during sun exposure
  • Take walks, garden, or eat lunch outside for natural light and movement
  • Consider talking with a healthcare provider about vitamin D if you have concerns about deficiency

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