another one for the 'if only' files

First we find out that Vitamin D is thought to prevent breast cancer.

Then came today's news that breast cancer is more likely spread in women who are deficient in the sunshine vitamin (from the Globe and Mail):

Women diagnosed with breast cancer are nearly twice as likely to have the disease spread to other parts of their bodies and are 73 per cent more likely to die from it if they have low levels of vitamin D, according to a Canadian study...younger women tended to have the lowest levels because they generally didn't use vitamin D supplements, which older women often take to prevent bone fractures.

“Vitamin D deficiency is common,” observed Pamela Goodwin, senior investigator at Mount Sinai Hospital's Samuel Lunenfeld Research Institute in Toronto and principal researcher on the study. “It's associated with high-grade tumours, and in our data set, it's associated with an increased risk of [cancer spread] and death.”