In an unexpected twist, health experts are now cautioning that steering clear of sunlight entirely may pose significant health hazards, potentially rivaling the dangers of smoking. The revelation stems from an extensive study that tracked the long-term effects of sun exposure on nearly 30,000 women, highlighting the critical role sunlight plays in our well-being.

Conducted by researchers at the Karolinska Institute, the study delved into the lives of 29,518 Swedish women aged 25 to 64 over two decades. Part of the Melanoma in Southern Sweden cohort, this research shed light on how varying degrees of sun exposure impact health and longevity.

Participants were asked about their sun exposure habits, which were categorized into three distinct groups: those who actively avoided the sun, those who had moderate exposure, and those who frequently enjoyed the sun. The study uncovered fascinating and eye-opening results.

The research, published in the Journal of Internal Medicine, revealed that women who shunned the sun had twice the risk of dying from all causes compared to their sun-loving counterparts. In a surprising analogy, the study further found that non-smokers who avoided sunlight shared a comparable life expectancy with smokers who basked in the sun the most.

Dr. Pelle Lindqvist, the lead researcher, emphasized the significance of these findings, noting that avoiding sun exposure could be “a risk factor for death of a similar magnitude as smoking.” This study underscores the need to balance sun exposure and highlights the potential health benefits that come with a bit of sunshine.

Lead researcher Dr Pelle Lindqvist said the findings indicated that shunning sun exposure could be “a risk factor for death of a similar magnitude as smoking.”

The women who avoided the sun also forfeited an estimated 0.6 to 2.1 years of life compared with those who routinely spent time outdoors.

Scientists believe numerous biological mechanisms could account for the connection between sunlight and improved health. One of the most recognised is the generation of vitamin D when the skin is exposed to ultraviolet B rays.

Vitamin D performs a crucial role in bone strength, immune function and cardiovascular health. According to the NHS, the vitamin is primarily produced through sunlight exposure rather than diet alone.

Researchers also believe sunlight may affect the body in other ways. Exposure to UV rays can prompt the release of nitric oxide from the skin, which helps reduce blood pressure and supports heart health.

The study discovered cardiovascular disease was the primary cause of the elevated mortality amongst people who shunned the sun. Women who kept out of sunlight were more prone to die from heart disease and other non-cancer ailments.

Nevertheless, experts emphasise the findings do not suggest people should begin sunbathing for extended periods. Excessive UV exposure remains a recognised risk factor for skin cancers such as melanoma.

Instead, scientists say the answer may lie in moderation. Moderate sunlight exposure without burning may deliver health benefits whilst still protecting the skin.