The primary function of vitamin D is to help maintain calcium phosphorus levels for healthy bone development and maintenance. (2) This is why as people get older, vitamin D levels become even more important as they can help prevent fractures and the development of osteoporosis.
Beyond the main function of bone health, vitamin D deficiencies have been shown to increase your risk for all major chronic diseases – including cancer, cardiovascular disease, and both metabolic and musculoskeletal disorders. (3)
Recent research has also shown that a deficiency can have a negative effect on your mental health – impacting both anxiety and depression. (4) The deficiency is also believed to exacerbate seasonal depression, which gives us a real scientific reason for the winter blues. Doctors often prescribe vitamin D supplements for seasonal depression, and some studies have shown that it is almost as effective as just getting the correct amount of sunlight exposure. However, only taking the supplement alone is not enough, as your body cannot absorb the supplemental form without the proper diet.