In the largest study of its kind, low levels of vitamin D are linked with a significant increase in colorectal cancer risk. Conversely, higher levels appear to offer protection.
Vitamin D is produced in the skin after contact with sunlight, as well as absorbed in our guts from several dietary sources — including fortified foods and fatty fish.
Its primary role was long considered to be bone maintenance. But, as researchers dig deeper, vitamin D’s sphere of influence widens.
