Colorectal cancer is the third most common cancer in both men and women in the U.S., excluding skin cancers, according to the American Cancer Society. A new study shows that people with high levels of vitamin D in their bloodstream have a lower risk of developing colorectal cancer. The study found vitamin D improves the immune system’s defenses against tumor cells.
The study looks at 942 people, 318 of the people had colorectal cancer and 624 did not. The participants gave blood samples in the 1990s before any of them developed cancer. The blood samples were tested for 25-hydroxy vitamin D, which measures how much vitamin D is in your body.
The researchers found that people with high amounts of 25-hydroxy vitamin D had a lower risk of getting colorectal tumors that have a large number of immune cells. The researchers of the study suggest that there is an interaction between vitamin D and the immune system that may work to prevent colorectal cancer.