the amount of melanin in their skin – darker skin requires longer than fair skin. The amount of time a person needs to produce enough vitamin D for good health depends on: So how much time does it take to produce enough vitamin D? At higher altitudes, there is less (thinner) atmosphere to absorb UV from the Sun. At angles greater than 45° above the horizon (at sea level), vitamin D production will be occurring, although some recent research suggests that vitamin D production may occur at angles as low as 30°. The angle of the Sun above the horizon (at sea level) also affects the production of vitamin D because the atmosphere is thicker at lower angles and absorbs more UV. These wavelengths are present when the UV index is greater than 3. The best rays for UV synthesis have wavelengths between 270–300 nm. Vitamin D is made when UV (more precisely, UVB rays) react with a compound (7-dehydrocholesterol) in the skin. What role does the Sun play in vitamin D production? Scientists judge issues by the amount and quality of data that is used to support claims. There are different opinions about many issues, for example, whether UV is good or bad. Scientists often find themselves in the middle of controversy. One study in 2006, using data on over 4 million cancer patients from 13 different countries, showed a marked difference in cancer risk for a number of different cancers between countries classified as sunny and countries classified as less sunny. This is why a lack of vitamin D causes brittle bones and diseases like osteoporosis.Īlso, medical research since 1970 has found an increasing amount of evidence that supports the hypothesis that vitamin D has significant, protective effects against the development of some cancers (particularly bowel cancer). 
For example, if we do not produce enough vitamin D by consuming it or being in the sun, our bodies can’t extract calcium from the food we eat, so our bodies then take it from our bones. Not many people consume sufficient vitamin D for their body’s needs, so most people need some sunlight to boost their vitamin D to the levels required for best health. due to various health disorders that limit absorption or conversion of vitamin D in the body.if too little time is spent outdoors in the sun.if there is too little vitamin D in foods and drink.
Research shows a clear link between sunlight and the synthesis of vitamin D in our bodies, so most people need sun exposure to produce enough vitamin D for best health.Ī deficiency of vitamin D in the body can happen:
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