Low vitamin D levels are especially common in areas of low winter light.
A recent study found that low vitamin D levels are linked to an increased risk of suffering a more severe stroke. People with low levels of vitamin D (less than 30 ng/ml), had about two times larger areas of stroke-related dead brain tissue than those with normal vitamin D levels.
Research has shown that low vitamin D levels can cause cancer, especially breast and colorectal cancer. Insufficiency is involved in cardiovascular disease, adult-onset-diabetes and multiple sclerosis. We also believe that low levels can damage your brain.
Another review in the Journal "Patient Safety in Surgery" found a link between insufficient vitamin D levels and adverse outcomes after surgical procedures.
On a high note, the results of another review study found a protective effect for vitamin D against the risk of developing lung cancer. Higher vitamin D status, was associated with a 16% lower risk of lung cancer in comparison with low status vitamin D.
Vitamin D is often low in athletes. Intense endurance training lowers blood levels of dihydrocholecalciferol (the active form of vitamin D) for up to four weeks after training ceases. Low blood vitamin D levels can cause muscle weakness and loss of calcium from bones. Athletes especially need to make sure they use a good vitamin D supplement.
We recommend that everyone supplement with vitamin D, especially those who live in northern areas with low levels of winter light. 3000 to 5000 iu per day as part of your supplement program is what we advise for all our clients.
Colgan, M. The Sun Will Save Your Life. Available ebook through Colgan Institute.
Henninger, N. Presented at International Stroke Conference, Feb 11-13, 2015.
Iglar P, Hogan K. Patient Saf Surg, 2015 Apr 30;9:14.
Cell Physiol Biochem. 2015 May 4.