Central and peripheral body fat distribution: Different associations with low-grade inflammation in young adults?

BACKGROUND AND AIMS: Evidence regarding the impact of regional body fat distribution on low-grade inflammation is limited. The current study examined the association of central and peripheral body fat distribution and low-grade inflammation levels in young adults, considering collinearity between variables. METHODS AND RESULTS: A cross-sectional analysis of 809 adults (aged 27 years) was conducted as part of the EPITeen cohort, Porto, Portugal. Regional body fat was measured by dual-energy X-ray absorptiometry scan (DXA) and serum high-sensitivity C-reactive protein (hsCRP) was measured in a fasting blood sample. OLS (ordinary least squares) and LASSO (least absolute shrinkage and selection operator) regression models were fitted to estimate the association of trunk and peripheral fat with hsCRP, stratified by sex. Using OLS regression, trunk fat in females was positively associated with ln(hsCRP) (β₁ = 0.064, 95% CI 0.018; 0.109). The effect of peripheral fat on ln(hsCRP) was shown not to be significantly different from trunk fat (β₂ = -0.011, 95% CI -0.110; 0.089), but no statistically significant association was observed (β₃ = 0.053, 95% CI -0.004; 0.110) between peripheral fat and ln(hsCRP). In males, trunk fat also showed a positive association with ln(hsCRP) (β₁ = 0.104, 95% CI 0.055; 0.154), and the effect of peripheral fat on ln(hsCRP) was shown to be significantly different from trunk fat (β₂ = -0.124, 95% CI -0.237;-0.011). However, the association between peripheral fat and ln(hsCRP) did not reach statistical significance (β₃ = -0.020, 95% CI -0.086; 0.046). The results of OLS were confirmed by LASSO regression. CONCLUSION: A higher fat deposited in the trunk was positively associated with hsCRP, whereas no statistically significant effect was observed for peripheral fat.