Why do sunbathers live longer than those who avoid the sun?

New research published in the Journal of Internal Medicine (JoIM) has found that women who had higher levels of sun exposure had lower instances of cardiovascular disease and lived longer – by .6 to 2.1 years longer — than women who avoided sun exposure.

A press release revealing those findings posed the question, “Why do sunbathers live longer than those who avoid the sun?” and called the findings a paradox.

What paradox? There is no paradox here. And this study merely confirms what previous studies have shown.

Increased sun exposure means increased natural levels of the steroid hormone vitamin D. Vitamin D interacts in a positive way with all the body’s organs and cells.

Three years ago, John Cannell, M.D., in his Vitamin D Council blog, looked at studies on two of the most commonly prescribed statin drugs – Lipitor and Zocor — and pointed out that researchers found that patients on Lipitor had lower oxidative stress and inflammation than those on Zocor. They posited that it was not because Lipitor reduces oxidative stress and inflammation better than Zocor; they both do that equally well. But Lipitor raises vitamin D levels more than Zocor does.

The new research in JoIM followed 29,518 Swedish women for 20 years. Researchers found that lower levels of sun exposure increased mortality in rates similar to smoking.

Now you may be asking what about the chance of melanoma skin cancer from increased sun exposure? Research published in PubMed in 2009 found that sun exposure may be just a scapegoat to explain away “diagnostic drift,” instances in which doctors classified benign lesions as stage 1 melanoma. In other words, physicians diagnosing non-cancerous lesions as cancerous accounted for a perceived rise in rates of melanoma. That research actually determined:

The distribution of the lesions reported did not correspond to the sites of lesions caused by solar exposure. These findings should lead to a reconsideration of the treatment of ‘early’ lesions, a search for better diagnostic methods to distinguish them from truly malignant melanomas, re-evaluation of the role of ultraviolet radiation and recommendations for protection from it, as well as the need for a new direction in the search for the cause of melanoma.

Further, a study in Medical Hypotheses found that melanoma rates are increasing in indoor workers far faster than outdoor workers, attributing this to the lack of vitamin D from sun exposure indoor workers get, along with an increase in UVA rays (which pass through windows) that cause cell mutations and break down vitamin D formed from outdoor sun exposure. Researchers also determined “inadequately maintained cutaneous levels of vitamin D₃ promotes” melanoma.

Vitamin D in the bloodstream is converted to calcitriol. Calcitriol is then used to repair damage to organs and cells, including damage caused by cancer cells and tumors. According to Joseph Mercola, M.D., vitamin D works by:

• Increasing the self-destruction of mutated cells (which, if allowed to replicate, could lead to cancer)
• Reducing the spread and reproduction of cancer cells
• Causing cells to become differentiated (cancer cells often lack differentiation)
• Reducing the growth of new blood vessels from pre-existing ones, which is a step in the transition of dormant tumors turning cancerous

Mercola also notes that “theories linking vitamin D to certain cancers have been tested and confirmed in more than 200 epidemiological studies, and understanding of its physiological basis stems from more than 2,500 laboratory studies, according to epidemiologist Cedric Garland, DrPH, professor of family and preventive medicine at the UC San Diego School of Medicine.”

Finally, studies show that women with breast cancer are three times more likely to have low vitamin D levels, and a study published in  Cancer Epidemiology, Biomarkers & Prevention has found that men with the highest levels of vitamin D lived longer after prostate cancer diagnosis than those with low levels of the hormone.

What’s more, vitamin D has been shown to influence dozens of other conditions including diabetes types I and II, cold and flu, aging signs, osteoporosis, seizures, Alzheimer’s disease, dementia, schizophrenia, inflammation, inflammatory bowel disease, multiple sclerosis, infertility, depression and asthma.

If every U. S. citizen began taking a daily dose of 5,000 IUs per day of vitamin D3, a very large segment of the medical industry would be hurt, some anti-cancer drug manufacturers would have to close their doors, thousands of patents would become worthless and lucrative consulting contracts between industry and cancer researchers would dry up.

For your supplement, be sure you are buying natural vitamin D3 (cholecalciferol) and not synthetic vitamin D2 (ergocalciferol). Most vitamin D prescriptions are for ergocalciferol.

Ergocalciferol has been linked to a host of health problems like high calcium levels; nausea; vomiting; constipation; loss of appetite; increased thirst; urinary dysfunction; altered mood and mood swings; severe lethargy; rashes; itching and swelling of the face, mouth and throat; severe dizziness; and breathing problems.

So why do sunbathers live longer than those who avoid the sun? Vitamin D.

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