The main reasons for the lack of vitamin d, people who live in urban areas, but the behavior is to have in the House. The ROM does not work because there is no sunlight or afraid of sunlight to dark skin.
Vitamin D deficiency causes the principle of people living in urban areas is that people will behave in the House. Working in the shade, not in direct sunlight because the sun will cause skin or fear.
The cause of vitamin D deficiency of people living in urban areas is people behavior is staying at home. In ่ทำงาน umbrella away from sunlight, because there is no time or afraid of sunlight will make the skin.