Author: G. Douglas Andersen, DC, DACBSP, CCN
Vitamin D first crossed my eye in 2003 when I noticed it was removed from many protein bars and meal-replacement protein drink mixes due to an FDA order. I thought at the time I would look into vitamin D toxicity. I cannot recall ever having a patient with hypervitaminosis D in my 18 years of practice. I was very worried that I had possibly missed or overlooked this problem. That is why I wrote “FDA’s Crackdown on Vitamin D is Troubling” two years ago.
When I researched that article it was very apparent that there was a growing problem with vitamin D. However, the problem I found was not excessive vitamin D, but the opposite, a deficiency that is commonly overlooked. I have no idea what literature the FDA regulators reviewed, but from what I could tell, there is mounting evidence that vitamin D deficiency is more important than many healthcare professionals were aware of. Interns in my office who are at or near the tops of their classes academically in chiropractic college do not appear to know much more about vitamin D that I did. I have also talked to colleagues in other allied health professions and I believe that schools may not be incorporating new literature into their curriculums fast enough.
This expands on what I wrote about both in my FDA Crackdown article in 2003 and last year “Vitamin D Deficiency.” You can find these articles on both my website and chiroweb.
Vitamin D – Did you Know?
- Lower serum and intake levels of vitamin D increase the rate of osteoarthritis. (OA)3
- Obesity alters endocrine function and promotes storage of vitamin D rather than utilization. Women with a body mass index over 30 have triple the rate of vitamin D deficiency compared to age matched women with a BMI of 18-25.4
- Running serum tests on the active form of vitamin D 1,25-dihydroxyvitamin D [1,25(OH)2D] showed no association between changes and OA. But in the same study low serum levels of its precursor 25 hydroxyvitamin D [25(OH)D] did correlate with joint space narrowing.5
- Vitamin D deficiency can cause chronic lower back pain.6
- Vitamin D deficiency is often misdiagnosed as fibromyalgia.7
- Animals genetically susceptible to of type 1 diabetes, rheumatoid arthritis, and multiple sclerosis did not develop these diseases when they were given Vitamin D throughout their lifetime.7
- Human milk contains very low levels of vitamin D.8
- Persons who do not get much sun exposure need at least 1000 IU of vitamin D a day to prevent deficiency. The more time we spend indoors, the greater this problem becomes, and our awareness of sunburn has further increased vitamin D deficiencies.7
- Sunscreen rated SFP-8, when used properly, stops 95% of vitamin D production.7
- Very dark-skinned people may need 6 times more sun than very fair-skinned people to produce adequate vitamin D.9
- Low vitamin D in adults has recently been identified as a risk factor for heart disease.10
- Vitamin D is extremely powerful in reducing the rate of cancer cell proliferation.7
- In the winter women were over 5 times more likely to have vitamin D deficiency than in the summer.4
- Cancer death rates are higher in people who have low exposure to sunlight.7
- Pregnant women need at least 2.5 –10 times more vitamin D (1000 – 4000 IU/d) than the current daily reference intake (DRI) of 200 – 400 IU/d.11
- 100,000 IU/d of vitamin D did not harm mothers or babies during pregnancy.11
- There is overwhelming evidence that healthy men use 3000 – 5000 IU/d of vitamin D.12
- Current research indicates 4000 IU/d of vitamin D maintains optimal levels. (The DRI states the tolerable upper limit is 2000 IU/d. Thus the outdated research implies that the current finding would cause toxicity.)13
- In a Finnish study of over 10,000 infants and children those who took 2000 IU/d in their first year of life reduced the incidents of developing type 1 diabetes 80% up to age 14.14