Are you severely vitamin D deficient, like more than half of all Americans? If so, then you are at increased risk for many diseases, including osteoporosis, cancer, heart disease, and autoimmune disease. Nearly 80% of Americans have vitamin D levels below the ideal range of 35 and 50 ng/mL.
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Why so deficient?
Sunlight is a great source of vitamin D, however, Americans spend a great deal of time indoors and generally are not exposed to enough sunshine to maintain levels of vitamin D at adequate levels to support optimal health. Furthermore, few foods naturally contain vitamin D. It is noteworthy that individuals with darker skin are at even greater risk of vitamin D deficiency. In fact, some experts hypothesize that this may, in part, explain higher rates of cancer and other diseases among darker skinned people. Prior to supplementation, I was severally deficient and had no idea until my doctor tested me, when my blood was drawn at the time of my annual physical exam.