Vitamin D Significantly Reduces Colorectal Cancer Risk

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“A critical weekly review of important new research findings for health-conscious readers”


As I discuss in my new book, A Cancer Prevention Guide for the Human Race, recent high-level clinical research studies have pretty much debunked the widely held belief that Vitamin C, Vitamin E, Vitamin A, beta-carotene, or selenium supplements are able to decrease cancer risk in humans,  However, as I also discuss in my book, there is an abundance of research data suggesting that Vitamin D (which actually functions more like a hormone than a vitamin) may, indeed, offer protection against certain types of cancer (as well as cardiovascular disease).  Unfortunately, however, as with all laboratory and clinical research findings, one can easily find other research studies that have reached contradictory results.

Meta-analysis is a powerful method of statistically combining the results of multiple smaller research studies, which often differ from each other in their methods, into one large “meta-study.”  While meta-analysis cannot always overcome the limitations of poorly conducted or otherwise weak research studies, it is a valuable tool to use in studying clinical problems for which large-scale prospective randomized clinical research trials have not yet been performed.

A newly published meta-analysis of the effects of Vitamin D on colorectal cancer risk appears in the current issue of the journalCancer Epidemiology, Biomarkers & Prevention.  In this meta-analysis, the findings of multiple previous Vitamin D clinical research studies were analyzed.  For every 100 IU of Vitamin D intake per day (up to 600 IU per day), a 5 percent decrease in the risk of colorectal cancer was observed.  Similarly, for every 100 IU/liter increase in the concentration of Vitamin D in the blood (up to 1800 IU/liter), colorectal cancer risk decreased by 4 percent.

The results of this meta-analysis confirm the findings numerous other prospective clinical research studies linking increased dietary intake of Vitamin D, and higher levels of Vitamin D in the blood, with a significant reduction in the risk of colorectal cancer.

Because excessive Vitamin D intake can cause serious health problems, I always recommend that you check with your doctor, first, before starting Vitamin D supplements (or other vitamin supplements).

For a complete evidence-based discussion of Vitamin D as a cancer prevention nutrient, order your copy of my new book, A Cancer Prevention Guide for the Human Race.  For the price of a cheeseburger, fries, and a shake, you can purchase this landmark new book, in both paperback and e-book formats, and begin living an evidence-based cancer prevention lifestyle today!


On Thanksgiving Day, 2010, A Cancer Prevention Guide for the Human Race was ranked #6 among all cancer-related books on the “Top 100 Bestseller’s List” for Kindle e-books! On Christmas Day, 2010, A Cancer Prevention Guide for the Human Race was the #1 book on the Amazon.comTop 100 New Book Releases in Cancer” list!

Disclaimer:  As always, my advice to readers is to seek the advice of your physician before making any significant changes in medications, diet, or level of physical activity

Dr. Wascher is an oncologic surgeon, professor of surgery, cancer researcher, oncology consultant, and a widely published author

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I and the staff of Weekly Health Update would again like to take this opportunity to thank the more than 100,000 health-conscious people, from around the world, who visit this premier global health information website every month. (More than 1.2 million health-conscious people visited Weekly Health Update in 2010!) As always, we enjoy receiving your stimulating feedback and questions, and I will continue to try and personally answer as many of your inquiries as I possibly can.

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One Comment on "Vitamin D Significantly Reduces Colorectal Cancer Risk"

  1. Vitamin D Decreases Diabetes Risk | Weekly Health Update on Wed, 1st Jun 2011 4:23 pm 

    […] Vitamin D Significantly Reduces Colorectal Cancer Risk […]

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