Interest in vitamin D has been increasing in recent months with a growing number of studies linking the vitamin to protection against osteoporosis and certain cancers. There is also evidence that a higher intake of vitamin D may be helpful with regard to high blood pressure, fibromyalgia, diabetes mellitus, multiple sclerosis, and rheumatoid arthritis.
In a new study, researchers used data from the 1739 participants in the Framingham Offspring Study to study the relationship between vitamin D levels and cardiovascular health risk. Although vitamin D levels above 30 ng/mL are considered optimal for bone metabolism, only 10 percent of the participants had levels in this range. In fact, 28 percent had blood levels lower that 15 ng/mL. Participants with levels below 15 ng/mL had a 62 percent greater chance to develop cardiovascular events than those with higher levels. People with low vitamin D levels and high blood pressure (> 140 and 90 mmHg), were found to have double the risk of cardiovascular problems compared to people with normal blood pressure and vitamin D levels.
Vitamin D is produced in the skin on exposure to UVB radiation (sunlight) and obtained in the diet from foods like oily fish, egg yolk, and liver. Recent studies have shown, however, that sunshine levels in some northern countries are so weak during the winter months that the body makes little to no vitamin D at all, leading to widespread deficiencies of the vitamin. In addition, increased skin pigmentation also reduces the effect of UVB radiation, meaning darker skinned people are more at risk.
The results from this study raise the possibility that treating vitamin D deficiency, by supplementation and/or lifestyle measures, could reduce the risk of cardiovascular events.
Circulation 2008 Jan 29;117(4):503-11.
In addition to the above statements concerning exposure to UV radiation, it can also contribute to skin cancer, making dietary intake all the more important, instead of relying upon sun exposure to be your source of Vitamin D. While milk can be an important source, to insure a steady supply in your body, we at the Complete Guide to Whole Nutrition encourage you to try a pharmaceutical-grade supplement, such as USANA's Essentials or the HealthPak 100, both found at www.WholeNutrition.USANA.com.