After decades of declining colon and rectal cancer rates, data published last week shows that these diseases have been increasing among young adults. Colon cancer rates have increased 2.4% annually among adults in their 20s and 1.0% among those in their 30s. For rectal cancer, the increase is even more dramatic: 3.2% among those in their 20s. For those born around 1990 the rates of colon cancer are more than two fold greater (2.4 times) than those born around 1950. Rectal cancer is over 4 fold greater (4.3 times) for those born around 1990 as compared to those born around 1950. – See more at: http://www.santamonicaprimarycare.com/blog/#sthash.11HBb8yb.dpuf
So the question, of course, is why the dramatic rise after decades of declining rates?
When I discuss colon and rectal cancer risks with patients, I often refer to two classic epidemiologic studies. The first study was done by Armstrong and Doll in 1975. It compared incidence and mortality rates for 27 cancers in 23 countries and correlated these with a variety of dietary habits and other variables. Dietary variables, particularly meat and animal protein consumption, was strongly associated with cancers of the colon and rectum. Further, these investigators confirmed prior data suggesting a protective effect of fiber consumption.

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