Vitamin D, which is actually a pro-hormone, actually plays an important role in regulating the entire human genome. 1,25-dihidroxyvitamin D, also known as calcitriol, is responsible for unlocking the more than 2,700 genetic binding sites specifically designed for it that are located throughout the human body. And every single one of the genes affected by calcitriol plays a role in the onset of most major human diseases.
What this means is that vitamin D deficiency can cause all sorts of illnesses, including everything from simple colds and influenza to chronic diseases like heart failure and cancer. And since vitamin D can really only be obtained in adequate amounts through natural sunlight or supplementation with high doses of vitamin D3, it is crucial that every individual pay close attention to his or her vitamin D levels.
The best way to obtain vitamin D is through natural sunlight exposure. A fair-skinned person can produce enough vitamin D from about 15 minutes of direct sunlight exposure during the peak summer months, while a darker-skinned person may need as much as an hour-and-a-half of sunlight exposure. Sunscreens are designed to block out the UV rays responsible for vitamin D production in the skin, so it is important not to wear sunscreen when trying to obtain vitamin D from the sun (http://www.vitamindcouncil.org).
Another option is to supplement with vitamin D3. The government’s recommended daily amount (RDA) for vitamin D is still too low, as most people need to take anywhere from 1,000 – 10,000 international units (IU) of vitamin D3 every day to maintain adequate blood levels. If you are unsure about your vitamin D levels, you may wish to have a blood test taken to determine what is an appropriate amount of vitamin D with which to supplement
Learn more; full article here: http://www.naturalnews.com/036247_sun_exposure_pancreatic_cancer_risk_reduction.html#ixzz1yRZ7xZYU