It makes sense that it happens as most cells in all organs have receptors for vitamin D. Vitamin D is not just for the bone.
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In a study published in Gut and New York Times (1/15/2015) showing “the higher the vitamin D level, the less likely one will develop colon cancer.” We read the comment from Dr. Shuji Ogino (Dana-Farber Cancer Institute), “Vitamin D boosts immunity not just in cancer, but in fighting infections as well.”
An article in New York Times reported adults with low levels of vitamin D would have 35% increased risk of death from heart disease and 14% greater likelihood of death from cancer.
Reports link low vitamin D levels to Parkinson disease, autism or psychosis. No wonder the vitamin D test skyrocketed the past 10 years or so.
Is this the sound science or the hype? One New York Times article asked.
The Institute of Medicine (the most prestigious and authoritative institute in medicine) issued a report in November 2010 claiming vitamin D and calcium play a key role in bone health and evidences do not support other benefits. It concluded that higher [vitamin D] level doesn’t confer greater benefit and may be harmful.
The Institute assessed more than 1000 studies/reports plus expert testimony related to various health outcomes. They found evidences (other than bone health) to be mixed and inconclusive. Current evidences support a role in bone health but not in other health conditions.
US Preventive Services Task Force (USPSTF) also issued a similar report in July 2012, saying “found insufficient evidence to recommend supplement to healthy people to prevent broken bone or cancer.”
Why so many experts are non-believers?
Almost all vitamin D studies are “observational”, lacking scientific rigor and strength. The experts are academicians who only have confidence on controlled double-blind trials.
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| making vitamin D in the garden |
Some hold a view that high vitamin D level is the result, not the cause, of good health. People may have high vitamin D levels because they exercise a lot and are getting ultraviolet-light exposure from working in the garden.
My recommendation
The experts do not recommend routine vitamin D blood test for healthy individuals. I may have ordered vitamin D tests more often than I should. However, if a normal vitamin D level is good for bone health; that alone is enough incentive to do the test, not that I believe in other potential benefits.
The normal vitamin D level: 25(OH) Vitamin D is 30-100 ng/ml.
National Osteoporosis Foundation recommends persons with osteoporosis to take 800-1000 IU vitamin D a day and 1200 mg calcium a day, whereas Endocrine Society recommends vitamin D 1500-2000 IU a day.
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| Vitamin D test skyrocketed |





























