In a recent article on CNN, a study by Dr. Pamela Goodwin of Mount Sinai Hospital in Toronto, found that only 24% of women in the study had sufficient blood levels of Vitamin D at the time their breast cancer was diagnosed. Those who were deficient were nearly twice as likely to have their cancer recur or spread over the next 10 years, and 73% more likely to die of the disease.
She commented that this was a significant difference and the first time that Vitamin D has been linked to breast cancer progression.
However what exact level of Vitamin D is still under question since in this particular study the women with the highest levels of Vitamin D had the worse outcomes.
Earlier research suggests that Vitamin D may help prevent prostate, breast and especially colon cancer.
The source of Vitamin D is at issue as well . While it's found in salmon and other oily fish, and milk is routinely fortified with it, dietary sources account for little of the amount circulating in the blood, experts say.
