Vitamin D has been getting a lot of media attention lately, as more and more research highlights just how important it is to our overall health. Last year, even the Canadian Cancer Society made the surprising move of recommending that all people supplement with vitamin D, suggesting it can slash cancer risk by 60%. This month, the National Post reported on a study showing that kids who get a vitamin D supplement are 30% less likely to develop type 1 diabetes in later life than those who don’t get vitamin D. The type 1 (juvenile) disease is most common among people of European descent, and the incidence is rising at about 3% a year.
Many people think that if we’re outside a few times per day and eat a healthy diet, we’ll get enough — but that’s not the case, especially for us here in Canada (or most of North America, for that matter). Our latitude is such that, for a good part of the year, the rays of the sun simply cannot strike our skin with enough intensity to manufacture adequate levels. And non-fortified food sources of vitamin D are actually quite scarce.
I received an informative e-newsletter from Dr Michael Murray, ND, the other day. It’s all about vitamin D and he outlines some interesting and helpful information. Here are a few tidbits:
- Vitamin D has protective effects noted against certain cancers (particularly breast and prostate), autoimmune diseases like multiple sclerosis and type 1 diabetes, and heart disease.
- A new study shows vitamin D reduces cellular aging, to the effect that a 70 year old women with higher vitamin D levels would have the biological age of 65 years.
- 40% of the U.S. population is vitamin D deficient (that usually means Canadians, too — perhaps even more so in our northern latitude).
- 42% of African American women of childbearing age are deficient in vitamin D.
- 48% of young girls (9-11 years old) are vitamin D deficient.
- 60% of all hospital patients are vitamin D deficient.
- 76% of pregnant mothers are severely vitamin D deficient
- 80% of nursing home patients are vitamin D deficient.
- From the latitude of San Francisco northward—or from Buenos Aires southward—for 3 to 6 months a year, no amount of exposure will generate substantial vitamin D in even the palest skin.
- Fish such as wild salmon, mackerel, and sardines are good sources of vitamin D3, while fortified foods include milk, orange juice, and some breads and cereals (D2).
- The vitamin D levels in farmed salmon are 75% less than wild caught salmon from Alaska.
- Dosages in the range of 800 to 2,000 IU per day are now recognized as being safe levels.
- The drugs cholestyramine (Questran®), colestipol (Colestid®), phenytoin (Dilantin®), phenobarbital, and mineral oil all interfere with the absorption and/or metabolism of vitamin D. Corticosteroids like prednisone also increase the need for vitamin D.
- Vitamin D supplementation must be used with caution when using digoxin (Lanoxin®) and thiazide diuretics.
This isn’t meant to be a place to make sales pitches, but really — for just pennies a day, there’s no reason we shouldn’t all be taking a safe vitamin with so much to offer. And with the new liquid versions available, it’s also easy to give kids. My own kids like it, and they’re pretty picky!