Low vitamin D is the same as a vitamin D deficiency. This condition leads to serious medical issues if left untreated. Vitamin D is necessary for strong bones because it helps the body process calcium, explains WebMD.
The body creates vitamin D, the sunshine vitamin, when exposed to sunlight, explains WebMD. Certain fish, egg yolks, fortified dairy and grain products, and fish liver oil also contain vitamin D. A common disease linked to vitamin D deficiency is rickets. Soft bones and skeletal deformities characterize rickets. Research reveals that vitamin D may help prevent and treat hypertension, diabetes, multiple sclerosis and glucose intolerance.