You have several options if you're interested in trying to prevent colon cancer --- but it's not clear whether boosting your vitamin D intake is one of them. Screening may be useful for prevention since colorectal cancers tend to grow slowly. However, while some research studies indicate that vitamin D might reduce the cancer risks for some people, the National Cancer Institute and other authorities say more research is needed.
About Colon Cancer
In colon --- or colorectal --- cancers, abnormal cells develop into growths called polyps that can become cancerous. The process usually takes 10 to 15 years, which is why early detection is stressed if you're at high risk for the disease. Risk factors include age, family history, certain intestinal ailments such as inflammatory bowel disease, obesity, a sedentary lifestyle and heavy consumption of red meats and processed meats.
Vitamin D and Health
Vitamin D is essential for your bones, nervous system, muscles and immune system. You get vitamin D through direct exposure to sunshine and from some foods and supplements. Vitamin D deficiency may be common, according to the M.D. Anderson Cancer Center, which reports that there is promising evidence for its role in limiting risks for some types of cancer. At least 600 IU of vitamin D is recommended daily for adults ages 19 to 70, and 800 IU for those 71 and older.
Vitamin D and Colon Cancer
Reviewing the studies on vitamin D and colon cancer, a cancer research agency for the World Health Organization concluded in 2008 that vitamin D may reduce the risk of colorectal cancer. But the research picture is complex, and agencies such as the American Cancer Society and the National Cancer Institute stop short of advising vitamin D supplements for prevention. Factors include conflicting results. At least one study that showed lowered risk for men but not women, and questions remain about the role of calcium, which interacts significantly with vitamin D.
Recommendations for Prevention
If a blood test reveals a deficiency, your doctor may recommend vitamin D supplements for your overall health. But have a discussion with your doctor before taking vitamin D for colon cancer prevention. Not only are there some hazards from taking too much, but some studies have shown that it may increase the risk for some cancers --- of the pancreas and prostate, for example. To lower your risks for colon cancer, the American Cancer Society advises you to undergo screening, maintain a healthy weight, exercise regularly and eat plenty of fruits, vegetables and whole grains.
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