Vitamin D is synthesised by body from| Animal …
What fat-soluble vitamin is synthesised by the body?
Our body's absorption of energy (photons) from the sun to create Vitamin D may be as significant to animal life (all animals generate Vitamin D from the sun) as the process of photosynthesis is necessary for plant life. The process of plant photosynthesis also uses the energy from the sun to convert carbon dioxide and water into organic compounds, especially sugars. In photosynthesis, plants release oxygen as a waste product. As well as maintaining the normal level of oxygen in the atmosphere, nearly all life either depends on photosynthesis directly as a source of energy, or indirectly as the ultimate source of the energy in their food.
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The effects of sun exposure are paradoxical with (i) skin cell DNA damage risk increasing with excessive sun exposure over decades on the one hand, and (ii) the essential health needs of Vitamin D synthesis from sun exposure on the other. In fair skinned individuals, maximum possible Vitamin D synthesis can occur within a few minutes of mid day summer sun exposure. Yet, Over the course of two decades, Vitamin D levels have dramatically decreased among Americans. Since sunlight is the body's major source of Vitamin D, increases in sunscreen, sun avoidance, and overall decreased outdoor activity, while successful in reducing skin cancers, has probably reduced vitamin D levels in the population.