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Vitamin D is also known as calciferol. Many people in the UK are deficient in Vitamin D. There are several reasons for this and the two main ones are: it is difficult to make any Vitamin D in the skin from November to March if you live north of Birmingham and there is growing pressure to use sun screen in the summer at all times.
Our body produces vitamin D from the action of sunlight on our skin. It is also available from foods including oily fish (herrings, sardines, trout, mackerel) and eggs. Fortified foods are a good source including low fat spreads and breakfast cereals, soya products, although be careful – these are often processed.
Vitamin D is protected in the body by the antioxidant vitamins A,C and E and often at low levels in those who have a lack of sunlight. It is depleted by a high consumption of fried foods. Do not exceed the upper safety limit of 4000 iu per day.