Women in Sweden who had 4 or more servings a day of full-fat dairy products (whole milk, cheese, butter, full-fat yogurt, cream, and butter) had a little less than half the risk of colorectal cancer than women who had less than 1 daily serving.
Over 60,000 women participating in the Swedish Mammography Cohort were had diets assessed when they first entered the study in the years froom 1987 through 1990 and again in 1997. With nearly 15 years of follow-up there were 798 cases of colorectal cancer. Adjusting for age and other variables affecting risk, the ratio of rates of colorectal cancer for women who consumed hight-fat dairy compared to those who did not was 0.59.
Researchers speculated that this was due to the conjugated linoleic acid (CLA) in dairy products, a potential anti-carcinogen.
Susanna C Larsson and colleagues from the Division of Nutritional Epidemiology in the National Institute of Environmental Medicine at the Karolinska Institutet in Stockholm reported their results in the [American Journal of Clinical Nutrition](http://www.ajcn.org/cgi/content/abstract/82/4/894), October 2005.