He believes that there is still not enough evidence to put vitamin D deficiency on the same level as high cholesterol and other known risk factors. "It is probably premature to consider vitamin D in the same light as those risk factors because this is one of the first clinical studies ... We don't know whether increasing vitamin D levels with some kind of supplement decreases risk. That would require some kind of trial." Vitamin D is known to be essential for strong bones, since it facilitates the body's uptake of calcium. Full Article at MedicineNet