(Borganic.org) Seventy percent of whites and 97 percent of blacks in the United States have insufficient blood levels of vitamin D, according to a study conducted by researchers from Harvard University and the University of Colorado, and published in the journal Archives of Internal Medicine.
Researchers used data gathered by the U.S. National Center for Health Statistics to examine the vitamin D blood levels of 18,863 U.S. residents between 2001 and 2004. They found that approximately 75 percent of teenagers and adults had levels below 30 nanograms per milliliter, on the low end of what is currently considered adequate for good health. Broken down by ethnicity, this translated into 70 percent of whites, 90 percent of Hispanics and 97 percent of blacks.
Deficiency is defined as any level below 20 nanograms per milliliter, based on guidelines adopted at the 13th Workshop Consensus for Vitamin D Nutritional Guidelines in 2007. Previously, deficiency was defined as less than 11 nanograms per milliliter, but the value was upgraded based on more recent research.
Scientists have known for a long time that insufficient levels of vitamin D can lead to the bone-softening disease rickets in children and can increase the risk of fractures and osteoporosis in adults. More recent research has strongly suggested, however, that even levels that are adequate for bone health may still be too low to protect against heart disease, cancer and autoimmune disorders.
The researchers found that the proportion of people with adequate vitamin D blood levels had dropped 50 percent since the time period between 1988 and 1994. They attributed this effect to people spending more time indoors than ever before, and going out only when protected by high-SPF sunscreen.
Because the body synthesizes vitamin D upon exposure to ultraviolet radiation from sunlight, excessive use of sunscreen can lead to deficiency. Light-skinned people can produce all the vitamin D they need from just 15 minutes of sun on the face and hands per day, while darker skinned people (depending on skin tone) may need up to five times as much sun exposure.
Sources for this story include: www.suntimes.com.
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1 comments:
The article states that the low end of good health starts at 30 nanograms per milliliter based on a 25(OH)D blood test. It should have mentioned that based on emerging medical research, the optimal range begins at 50 ng/mL. Ideally you want to be between 50 and 100 ng/mL. Keep in mind that 200 ng/mL begins the toxic range.
How do you get 50 ng/mL? For most people it requires a daily intake of 5000 IU of vitamin D3. Some need as much as 10,000 IU to reach that level. Keep in mind 40,000 IU equals one milligram, so although the numbers seem large, the actual amounts are miniscule. 40,000 IU also happens to be the amount that will bring you to the toxic range if you consume it every day for 6 months.
Medical science has determined that having a blood level over 50 ng/mL reduces your risk of many serious diseases by more than half. The list includes 17 kinds of cancer, cardiovascular diseases like stroke and heart attack, diabetes, and a long list of other serious chronic degenerative diseases.
Multi vitamins typically contain 400 IU so that amount is too small to provide meaningful protection. Milk contains around around 100 IU per glass so it is inadeqauate. The sun can give you some vitamin D but for most of the country during most of the year it is unlikely to give you what you need. Supplementation is the most reliable way to obtain adequate vitmain D.
If all Americans supplemented their way to 50 ng/mL the death rate would drop by hundreds of thousands per year. According to the CDC, 2 million people die of chronic degenerative diseases, most of which are preventable by simple lifestyle adjustments. Vitamin D happens to be the easiest for those who refuse to give up their deadly vices.
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