10 - 15 Even in sunny areas like Saudi Arabia, vitamin D deficiency is very prevalent. A high number of otherwise apparently healthy children, adolescents, pregnant women, and adults are vitamin D deficient. Globally, vitamin D deficiency has been noted in many countries. 2, 3 Research during the past two decades has illustrated the importance of vitamin D in reducing the risk of cancer, 4 - 6 multiple sclerosis 7, 8 and type 1 diabetes mellitus. 1 Additionally, the enzyme responsible for conversion of 25-hydroxyvitamin D to its biologically active form 1,25-dihydroxyvitamin D has been identified in other tissues aside from the kidneys.
1 Furthermore, the presence of vitamin D receptors (VDR) in other tissues and organs suggest that vitamin D function extends beyond bone homeostasis. The role of vitamin D in both calcium absorption and metabolism for bone health is well known. There is growing evidence that vitamin D sufficiency is required for optimal health. This strategy is a highly efficacious way for improving the vitamin D status for children and adults and preventing vitamin D deficiency. These times are important on a public health perspective, as it’s free, relatively safe and the most enjoyable.
In conclusion, the optimum time to get sun exposure for vitamin D 3 production in Riyadh, during summer is from 9:00 AM and before 10:30 AM, as well as after 2:00 PM until 3:00 PM, while during winter it’s from 10:00 AM until 2:00 PM. During wintertime however, the conversion began later at around 9:30 AM and ended sooner at 2:00 PM, with peak hours at 10:00 AM to 12 noon. In this study, summer production of previtamin D 3 was observed to occur between 8:00 PM to 4:00 PM with peak hours between 10:00 AM to 12:00 PM. Our results demonstrated that the time of the day has a major influence in vitamin D production.
Ampoules containing 7-dehydrocholesterol in ethanol were exposed to sunlight every hour starting from sunrise until sunset in July and December. In this study we aimed to determine the optimum time for sun exposure in the Central region of Riyadh, Saudi Arabia. Sunlight has long been recognized as a major provider of vitamin D.
Low levels of 25-hydroxyvitamin D have been documented among inhabitants of the wider Middle East and North African countries.
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