Professor Nattavudh (Nick) Powdthavee is a Professorial Research Fellow at the Melbourne Institute of Applied Economics and Social Research. His research interests are quantitative social and behavioural sciences.
For more information contact: Professor Robin Daly on 9244 6040 or Dr Peter Ebeling on 8395 8065
he paper is the largest study of its kind, drawing on 11,218 people from the AusDiab Study and includes Australians from Darwin to Hobart. Professor Rob Daly, Chair of Exercise and Ageing at Deakin University, honorary fellow at the University of Melbourne and the study leader said the findings showed strategies were now needed to improve Vitamin D awareness.
The overall prevalence of vitamin D deficiency (<50 nmol/L) was 31% with women being more commonly affected (39% vs 23% in men, overall). When evaluated by season and latitude, 42% of women and 27% of men in southern Australia during summer/autumn had deficient levels, which increased to 58% and 35% in women and men, respectively, during winter/spring. This indicates that late winter and early spring are the best times to measure vitamin D levels in the blood to detect deficiency.
Vitamin D is necessary for optimal health. Those at greatest risk for vitamin D deficiency included women, the elderly, obese, those not meeting the current physical activity guidelines of more than two and a half hours a week, and those of non-European descent.
Importantly, vitamin D deficiency was more common in older and elderly women, the ones most at risk of fractures and falls, both of which are associated with vitamin D deficiency. “Low levels of vitamin D can contribute to a number of serious, potentially life-threatening, conditions such as softened bones; diseases that cause progressive muscle weakness leading to an increased risk of falls, osteoporosis, cardiovascular disease, certain types of cancer and type 2 diabetes.
“While it was reassuring that only 4 per cent of the population had severely deficient levels, national strategies are urgently needed to attack the high prevalence of vitamin D deficiency in Australia before the problem worsens,” said Professor Daly
“Vitamin D deficiency is recognised as a global public health problem but the population-based prevalence of deficiency and its reach in Australia has never previously been properly examined,” he said.
Professor of Medicine (Assistant Dean) and Chair of the NorthWest Academic Centre, Western Section, at the University of Melbourne and co-author on the paper Professor Peter Ebeling and said it was timely and appropriate to develop national strategies and an awareness campaign for balancing safe sun exposure and adequate vitamin D intake.
“The high prevalence of Vitamin D deficiency in our study may also be associated with increasing prevalence of obesity in Australia. Like many developed countries, Australia has experienced an increase in the prevalence of overweight and obesity over the past 20 years. This is likely to be caused by both decreased sun exposure from limited mobility and/or reduced outdoor physical activity,” he said.