Red meat and processed meat intake and risk of colorectal cancer: a population-based case-control study

To examine the association between red meat subtypes intake and risk of colorectal cancer (CRC) among Jewish and Arabs populations in a unique Mediterranean environment. The Molecular Epidemiology of Colorectal Cancer study (n=10 026) is a prospective population-based case-control study in northern Israel. Participants were interviewed in-person about their dietary intake and lifestyle using a questionnaire that included a food-frequency questionnaire. Red meat consumption in Israel was found to be especially low in the Jewish population (1.29±1.45 servings/week), but higher in Arabs (3.0±1.98 servings/week) (P<0.001). Beef was the most commonly consumed red meat by Jews (1.15/1.29 servings/week, 89%) and proportionally less so by Arabs (2.00/3.00, 67%). Processed meat consumption (mostly pork free) was lower among Arabs (0.9±1.56 servings/week) compared with Jews (1.97±2.97 servings/week) (P<0.001). The adjusted odds of CRC per one serving/week of red meat were 1.05 (95% confidence interval: 1.01-1.08) in Jews and 0.94 (0.88-1.01) in Arabs. Compared with no consumption, beef consumption was associated with odds ratio (OR)=0.96 (0.86-1.07) in Jews and 0.94 (0.61-1.45) in Arabs, lamb consumption with OR=1.28 (1.10-1.5) and 1.01 (0.75-1.37), pork consumption with OR=1.44 (1.24-1.67) and 1.07 (0.73-1.56), and processed meat consumption with OR=1.22 (1.10-1.35) and 1.04 (0.82-1.33) in Jews and Arabs, respectively. Overall red meat consumption was associated weakly with CRC risk, significant only for lamb and pork, but not for beef, irrespective of tumor location. Processed meat was associated with mild CRC risk.