Why is it important to make sure we get a regular intake of the sunshine vitamin known as vitamin D? What are the conditions that can develop from vitamin D deficiency and who are the people likely to be affected? Dr Chris Steele answers such questions in this brief overview of the importance of vitamin D to our health, the dangers of vitamin D deficiency, what causes it and how can it be diagnosed, as well as the common and more serious illnesses that can develop from it.