Winter and vitamin D deficiency: Does it matter anyway?

<ul> <li>Vitamin D deficiency is common in Australia, affecting nearly one-third of adults aged over 25 years.</li> <li>The main source of vitamin D for Australians is exposure to sunlight. Thus, serum levels of vitamin D vary according to the season and are lower at the end of winter.</li> <li>'A great deal of the population suffers from vitamin D deficiency, especially during winter months'.</li> </ul>