Abstract
BACKGROUND: Colorectal cancer (CRC) is a significant public health problem, including Morocco. The Mediterranean Diet (MD) has demonstrated potential anticancerogenic effects toward CRC in Northern Mediterranean countries. Using a Modified Mediterranean Diet (MMD) score adapted to southern countries, we investigated the relationship between adherence to the MD and the risk of CRC among the Moroccan population. MATERIAL AND METHODS: During the study, we recruited 395 cases matched with 395 controls by sex and age (± 3 years). Using an adapted Food Frequency Questionnaire, we assessed the dietary intakes of participants to calculate the MMD score. We estimated the odds ratio and 95% confidence interval for both basic and adjusted models to evaluate the relationship between adherence to the MD and the risk of CRC. RESULT: We observed a significant inverse association between adherence to the MD and CRC risk. In the adjusted model, moderate adherence to the MD was associated with 52% lower risk of CRC [odds ratio (OR*): 0.48 and 95% confidence interval (95% CI): 0.37-0.69], while high adherence to the MD was associated with 61% lower risk of CRC compared to the lowest category. When stratified by sex, both moderate [OR*: 0.36 (CI95%: 0.27-0.55)] and high [OR*: 0.43 (CI95%:0.27-0.74)] adherence were inversely correlated with CRC risk for women, while for men, only high adherence was inversely correlated with the risk of CRC [OR*: 0.3 (CI95%:0.19-0.5)]. CONCLUSION: Adherence to MD is associated with a decreased risk of CRC, an association that may be influenced by tumor location, sex, and age. Despite certain differences between northern and southern countries, the MD can be an effective preventative measure against CRC for populations in the Southern Mediterranean region.