Abstract 1889: Paleolithic and Mediterranean diet pattern scores and their associations with biomarkers of inflammation and oxidative balance

Chronic inflammation is associated with poor diet quality as well as risk for cancer and other chronic diseases. A diet-inflammation association may relate to evolutionary discordance. We investigated associations of two diet pattern scores, the “Paleolithic” and the Mediterranean, with circulating levels of two inflammation-related biomarkers, C-reactive protein (CRP), an acute inflammatory protein, and F2-isoprostanes, a reliable marker of lipid peroxidation in vivo, in a colonoscopy-based, pooled case-control study of incident sporadic colorectal adenomas (N = 646). We created diet scores from responses on a modified Willett food-frequency questionnaire, and measured plasma levels of CRP and F2-isoprostanes by ELISA and GCMS, respectively. Both diet scores were calculated and categorized into quintiles, and their associations with the biomarker levels were estimated using unconditional logistic regression. The multivariable-adjusted odds ratios (OR) comparing those in the highest relative to those in the lowest quintiles of the Paleolithic and Mediterranean diet scores, were, respectively, 0.73 (95% confidence interval [CI] 0.39, 1.36; Ptrend = 0.35) and 0.71 (95% CI 0.36, 1.40; Ptrend = 0.12) for CRP levels, and 0.35 (95% CI 0.17, 0.74; Ptrend