Causes of vitamin D deficiency include intestinal malabsorption which can be seen with celiac disease or Crohn's disease, not enough UV light exposure, like in homebound, elderly populations.
引起维生素D缺乏的因素包括：小肠吸收不良，可见于乳糜泻和克罗恩病；紫外线照射不足，常见于久居家中的老年人。
Intestinal malabsorption
原声例句
Osmosis-肌骨
英语百科
Malabsorption
（重定向自Intestinal malabsorption）
Malabsorption is a state arising from abnormality in absorption of food nutrients across the gastrointestinal (GI) tract. Impairment can be of single or multiple nutrients depending on the abnormality. This may lead to malnutrition and a variety of anaemias.
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