Most people in the UK are vitamin D deficient in the winter and should ensure that their diet includes dairy products like milk and yoghurt or vitamin D supplements. If you are elderly or not Caucasian it is recommended that you speak to your GP about blood tests to check that you are getting enough vitamin D for good health.
Principal Clinical Scientist, John Christofides in a couple of plain English articles explains the latest scientific evidence supporting the role of vitamin D and how, if we are worried, we can request a test to measure our own levels.

It really is quite extraordinary just how prevalent vitamin D deficiency is – especially when you bear in mind the associated health implications as important as osteoporosis. John Christofides makes a number of excellent points in his articles highlighting the extent of the issue, those people at greater risk and what practical steps can be taken by both governments and individuals.