A just-published article in the American Journal of Epidemiology reports a very clear negative correlation between colorectal cancer and omega-3 consumption. It describes the results of a case-control study done in Scotland from 1999 to 2006. The investigators hoped to recruit all cases of colorectal cancer coming for surgery in Scotland; they managed to recruit about half of them and ended up with about 1500 “cases.” Each case was paired with a healthy control matched for age, sex, and residence. Then they compared the diets of the two groups. This is the approach that first linked smoking and lung cancer.
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