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Vitamin D is essential for calcium metabolism and bone growth, as well as for maintenance of mental health in children and adults. Around 80% of the vitamin D requirement of our body is fulfilled through its synthesis from cholesterol in a sunlight-dependent manner, and hence it is also known as the 'sunshine vitamin'. The dietary sources of this vitamin are very few, and mainly include oily fish like salmon, mackerel and herring.
Reduction in the levels of vitamin D, or hypovitaminosis D, may occur due to limited exposure to sunshine, defects in the synthesis and absorption processes or due to insufficient dietary intake. The initial symptoms arising due to a lack of vitamin D include fatigue, bone and joint pain, muscle aches and twitching, etc. Prolonged deficiency leads to rickets and osteomalacia which are known as the classical vitamin D deficiency diseases.
Read more at Buzzle: http://www.buzzle.com/articles/lack-of-vitamin-d-symptoms.html
More info here>>http://www.patient.co.uk/health/vitamin-d-deficiency-including-osteomalacia-and-rickets-leaflet
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