Vitamin D deficiency often occurs as a single nutrient deficiency, which can occur even in a well-nourished person. The main reason for this can be:
1
Foods containing high amounts of Vitamin-D are consumed by poor and rich people for various cultural reasons.
2
The content of vitamin D in foods depends on the soil in which the food was grown, which is not related to wealth or age.
3
Most of the vitamin D in the body does not come from food, so access to food is not a significant determinant of vitamin D status.
4
A diet containing enough other nutrients to promote growth can increase the need for vitamin D, so that it can become limiting.
5
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