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Resources Researches have concluded that relatively brief but unfettered exposure to sunshine or its equivalent several times a week can help to ward off a host of debilitating and sometimes deadly diseases. These diseases include osteoporosis, hypertension, diabetes, multiple sclerosis, rheumatoid arthritis, depression and cancers of the colon, prostate and breast.
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Eugene Butcher at Stanford University in California, US, and colleagues discovered an interesting immune process in human skin. Immune cells in the skin, called dendritic cells, convert vitamin D3 (produced in exposed skin in response to sunlight) into its active form.
This “active” vitamin D3 then causes T-cells to make surface changes that allow them to migrate to the uppermost layer of the skin, Butcher’s team found. T-cells are the immune cells that destroy damaged and infected cells, and they also regulate other immune cells.

The theory that controlled exposure to sunshine can have powerful health benefits, stems from decades of research into the many roles played by vitamin D in the body. It was found that the main source of this essential nutrient is neither food nor dietary supplements. It is sunshine.
Vitamin D is made in the skin when it is exposed to the ultraviolet B (UVB) rays in sunshine, as well as those from tanning machines. But the amount of vitamin D formed in a given period of sun exposure depends on the color of that skin -- that is, how rich the skin is in melanin, which blocks UV rays.

Despite all the benefits of sunlight, exposure to too much sunlight and at the wrong time of the day can cause more harm than good.  Grate care has to be taken in regards to how much sunlight we expose our bodies to. It is recommended that we expose ourselves to the first four hours of the day and the last two hours of the day.  The darker a person's skin, the longer he or she has to be in the sun to form a significant amount of vitamin D.
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