Although researchers are becoming increasingly aware of just how important vitamin D is to human health, deficiency and insufficiency remain common, according to a global survey conducted by Dutch researchers and published in The Journal of Steroid Biochemistry and Molecular Biology in 2010.
Researchers have long known that vitamin D is essential for the formation and maintenance of healthy bones and teeth. In recent years, however, study after study has confirmed a critical role for vitamin D in regulating the immune system and other important bodily processes. Studies have also shown that levels sufficient to protect against rickets might still lead to chronic diseases such as cancer, cardiovascular disease, diabetes and autoimmune diseases such as type 1 diabetes, multiple sclerosis or rheumatoid arthritis. In contrast, higher vitamin D intake can help prevent or even possibly cure such.