Monday, May 12, 2008

Vitamin D Benefits and AutoImmune


Here's an interesting article from the Washington Post, discussing the benefits of Vitamin D and autoimmune diseases. Check it out! (And thanks, Leslie, for sending me the article.)

Research suggests vitamin D has key health benefits
By Sally Squires, The Washington Post

Imagine a nutrient that could help prevent cancer, heart disease and tuberculosis, preserve bones and thwart autoimmune diseases such as multiple sclerosis, rheumatoid arthritis and juvenile diabetes. Too good to be true?

But that’s the potential promise for vitamin D, a nutrient whose usefulness was once thought to be limited to prevention of rickets in children and severe bone loss in adults. Known as the “sunshine” vitamin because it is naturally produced when the skin is exposed to ultraviolet light, vitamin D has been garnering increasing attention recently. “There’s a drumbeat about vitamin D that is being played very loudly,” says Mary Frances Picciano of the Office of Dietary Supplements at the National Institutes of Health. Just this month, the American Journal of Clinical Nutrition published a special supplement highlighting widespread vitamin D deficiencies “in various populations throughout the world, including ‘healthy’ people in developed countries where it was thought that (the) deficiency was obsolete.”

The National Cancer Institute and the federal Office of Dietary Supplements have both convened scientists to review vitamin D data this past year. And last fall, the federal Agency for Healthcare Research and Quality issued a review of vitamin D that found it essential for bone health at all ages. “There are a lot of benefits to vitamin D that have surfaced in the last 20 years,” notes Hector DeLuca, a University of Wisconsin biochemist who has been a pioneer in vitamin D research.

Among the more intriguing findings is a recent review of 18 studies involving nearly 60,000 people that showed those who took vitamin D supplements had a 7 percent reduction in mortality compared with those who didn’t take the vitamin. Another recent study found that lung cancer patients who either got a lot of sun or had a high intake of vitamin D had three times the survival rate of their counterparts with lower vitamin D levels.
Despite these encouraging results, scientists are also quick to note that much of the vitamin D research is limited to animals — not people. “We still don’t have all the information to go to the next step,” Picciano says.

In the meantime, an increasing number of physicians use a simple blood test to check vitamin D levels in patients. Testing runs about $100. Experts believe that 25 to 40 nanograms per milliliter is a reasonable target for vitamin D blood levels. But, DeLuca says, population studies suggest “that if you can get to 60 to 70 nanograms per milliliter that maybe you can address some other health problems.” Rates of colon cancer, for example, are about 50 percent lower in sunny parts of the world and in regions such as Norway where there’s a high consumption of fatty fish, which are rich in vitamin D. Just 3½ ounces of salmon provides 90 percent of the daily value of vitamin D for most adults. Sardines, tuna, eggs and liver also are rich in the vitamin, as are fortified milk and margarine.

Another option is take a dietary supplement. Based on the recent vitamin D research, DeLuca began taking 1,000 international units of vitamin D daily. He also consumes a diet that includes some vitamin D-fortified foods. He estimates that his total daily intake hovers around 2,000 IU daily — the level that the National Academy of Sciences sets as the tolerable upper-limit intake for adults. (Adequate daily intakes are 200 IU for those 19 to 50 years old; 400 IU for adults 51 to 70; and 600 IU for those 71 or older.) Too much vitamin D can be toxic. “I am only confident to go to about 2,000 or 3,000 IU per day,” DeLuca says.

DeLuca, dermatologists and scientists say that because of increased skin cancer risk from exposure to the sun, it’s best to get vitamin D “from fortified foods and capsules.” If you prefer the sun, however, just 20 minutes of exposure without sunscreen enables the skin to produce about 20,000 IU of vitamin D — equivalent to drinking about 400 glasses of milk.
Contrary to taking mega doses of dietary supplements, sun exposure does not appear to cause vitamin D toxicity.
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Some other good sources of Vitamin D: Salmon, Tuna, some Orange juices, and Fortified Cereals (see specific packaging for details). And for more information on Vitamin D, click here.

1 comment:

  1. Keeping my Vitamin D levels up is one of the hardest things I struggle with when it comes to having Lupus (and the one thing my rheumatologist gets on me about). In addition to taking a 50,000 IU Vit D capsule once a week, I try to remember to take 2 Calcium + D tablets per day to boost my Vit D even more. The hard thing for me is remembering to take them with a full meal so they actually get absorbed.

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