Posted by 
Breast cancer is the leading cancer among women, reproductive risk factors such as early puberty, late menopause, later age at first pregnancy, never having been pregnant, obesity, and a family history have all been shown to be associated with breast cancer development.
Vitamin D may reduce cancer risk in women with a lower body mass index, the study involving more than 650 Brazilian women suggests that vitamin D may reduce cancer risk by inhibiting cell proliferation. Researchers involved in the study concluded that postmenopausal women had an increased risk of vitamin D deficiency at the time of their breast cancer diagnoses, associated with higher rates of obesity, than women of the same age group without cancer.
Similar studies also have previously demonstrated a relationship between vitamin D and breast cancer mortality. Women in the highest quartile of vitamin D concentrations, in fact, had a 50% lower death rate from breast cancer than those in the lower quartile, suggesting that vitamin D levels should be restored to a normal range in all women with breast cancer.
Higher levels of vitamin D in the body are associated with lowered breast cancer risk, vitamin D may play a role in controlling breast cancer cells or stopping them from growing. Vitamin D comes from direct sunlight exposure, vitamin D3 supplements, or foods rich in vitamin D.
haleplushearty.org