Vitamin D has long been linked to bone health; when researchers discovered that rickets was caused by a deficiency of the vitamin, public health experts urged the fortification of this staple with vitamin D, which made milk, already naturally rich in calcium, virtually synonymous with bone health. More recently, however, researchers are finding more evidence that vitamin D is a critical nutrient; it is also essential for muscle, nerve and immune system function and may play roles in cancer, dementia and depression. Vitamin D is also produced by skin cells, in the presence of sunlight, though our ability to manufacture the vitamin declines with age. Different forms of vitamin D can be measured in the blood (including active versions and inactive precursors); testing is likely to increase as research reveals the importance of the vitamin to overall health.

BASELINE YOUR HEALTH VIDEOS

CHAPTER 1 Baseline Your Health When it comes to our wellness journeys, it is true that we all start from a different place... VIEW VIDEO

CHAPTER 4 Your Doctor's Visit A physical exam helps a doctor take the measure of your health. Current concerns are addressed and problems spotted... VIEW VIDEO

CHAPTER 8 Complete Blood Count, and Baselining Your Health Our lifeblood is a complex fluid and a complete blood count (CBC) measures the fundamentals... VIEW VIDEO

CHAPTER 10 Lipids, Heart Health and Baselining Your Health What individuals eat is reflected in their blood chemistry and the health of their cardiovascular system... VIEW VIDEO

CHAPTER 14 Blood Glucose and Baselining Your Health Blood glucose levels naturally fluctuate, but insulin from a healthy pancreas keeps levels within a narrow range... VIEW VIDEO

CHAPTER 16 (currently viewing) Vitamin D and Baselining Your Health Vitamin D is essential to bone health, but it may also be important for muscle, nerve and immune system function and may play... VIEW VIDEO