Factor #1: Usage of Sunscreen: In order for cutaneous Calcitriol (Vitamin D), it requires UVB rays from sunlight. Consequently, sunscreens that block the sun’s UVB radiation also stop your skin from creating Calcitriol (Vitamin D). This is an important factor to keep in mind, especially because sunscreen protects us from the sun’s damaging effects, including premature skin aging and skin cancer.
Factor #2: Skin Color: The degree of skin pigmentation also determines how well the skin can make Calcitriol from sunshine. The more pigmented the skin is, the more difficult it is for your skin to make Vitamin D (Calcitriol). This is because skin pigmentation is a natural sunscreen that filters out UVB radiation, which is important for vitamin D manufacturing.
Factor #3: Your Weight: vitamin D is a vitamin soluble in fat, which means it is tucked away in your fat tissue. The more fat you possess, the more Calcitriol is stored in the fat stores, which means less vitamin D makes its way into your circulation, this is called decreased bioavailability. Vitamin D deficiency is strongly correlated with obesity and many studies have demonstrated that there is substantially decreased bioavailability of vitamin D in overweight people.
Factor #4: Your Age: Aging also reduces the skin’s ability to manufacture vitamin D from sunshine. Studies have demonstrated that a seventy year old person manufactures 4 times less vitamin D from the sun than a twenty year old. Recognition of this difference is very important for the elderly who may spend minimal amount of time in the sun, and exclusively depend on sun exposure for their vitamin D needs.
Although our bodies are capable of producing plenty of vitamin D from the sun, the previously mentioned factors influence the ability of vitamin D synthesis by our dermal tissues. It is necessary to understand that vitamin D attained through food sources is not influenced by any of these limiting factors. The Food and Drug Administration’s listed daily requirement of vitamin D is only 400IU, however, several scientific studies contest this minimal dosage and seem to indicate a need for a higher daily supplementation. The National Institute of Medicine recommends 2,000IU a day for healthy adults. Due to the lipid-solubility of vitamin D, amounts larger than 10,000 IU every day may be toxic unless prescribed by a medical doctorwho has checked your circulating Vitamin D levels.
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