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قطعة فيتامين دال

1. Vitamin D is the only vitamin that the body can manufacture, when the skin
is exposed to sunlight. However, for 6 months of the year (October to April),
much of Western Europe does not receive enough UV rays in sunlight to
make vitamin D in the skin. So, many people living there are at risk of not
getting enough vitamin D unless they get it in their diet. Also, people who
have darker skin, such as people of African, African-Caribbean and South
Asian origin, are at risk because their skin reduces UV light absorption.


2. Foods that provide vitamin D includes oily fish such as sardines and
mackerel, fish liver oil, butter, milk, cheese and egg-yolk. In addition, many
manufactured food products contain vitamin D supplements.



3. Vitamin D helps in the absorption of calcium and phosphorus through the
gut wall. Bone is made of the mineral calcium phosphate. A lack of the
vitamin therefore results in poor calcium and phosphorus deposition in
bones, leading to softening. The weight of the body can deform bones in the
legs, causing the condition called rickets in children. Adults deficient in
vitamin D can suffer from osteo-malacia; they are very vulnerable to
fracturing bones if they fall

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