Vitamin D guidelines

Vitamin D and health in adults in Australia and New Zealand: a position statement, by John J McGrath and Caryl A Nowson, is a recent article in the Medical Journal of Australia.  Vitamin D status has emerged as a significant public health issue in Australia and New Zealand, and here the authors provide updated guidance to clinicians and health professionals on the role of vitamin D in health for adults. 
Most adults are unlikely to obtain more than 5-10% of their vitamin D requirement from dietary sources, so exposure to sunlight is important.  For moderately fair-skinned people, a walk with arms exposed for 6-7 minutes  mid morning or mid afternoon in summer, and with as much bare skin exposed as feasible for 7-40 minutes at noon in winter, on most days, is likely to be helpful in maintaining adequate vitamin D levels in the body. 
Med J Aust 2012; 196 (11): 686-687