High vitamin D levels linked to lower risk of colon cancer

High vitamin D levels linked to lower risk of colon cancer. Study finds people with highest vitamin D blood levels have 40% lower risk of colon cancer than those with lowest - People with high levels of vitamin D in their blood have a lower risk of colon cancer than those with low levels, according to a large European study published today in the . It is estimated that around three in every hundred people in Europe will develop colorectal cancer during their lifetime. Today's research found that people with the highest blood levels of vitamin D had a 40% lower risk of colon cancer than those with the lowest. No such association was observed for rectal cancer in the study, which was led by teams from Imperial College London and the International Agency for Research on Cancer. Previous laboratory work had suggested that vitamin D may help prevent the growth of colon tumours. However, earlier epidemiological studies, which mainly used dietary questionnaires to compare how much vitamin D people were obtaining, had proved inconclusive.