Vitamin D made by the action of sunlight on the skin accounts for 90 per cent of the body's supply, but lower levels can also be obtained through food such as fish, eggs and breakfast cereals.

通过阳光刺激皮肤产生的维他命D可以提供人体90%的需要，但是其也可以通过鱼类，鸡蛋和谷类来提供。