C‐reactive protein (CRP) blood concentrations associate with reduced global system segregation in middle‐aged individuals

High concentrations of circulating C‐reactive protein (CRP) have been related to poorer cognition in adults (Lewis et al. Age Ageing. 2021;50:2199). Within the Lifebrain consortium (Walhovd et al. Eur Psychiatry. 2018;50:47), we recently reported overall lifespan associations between increased CRP and smaller hippocampal (HPC) volumes, albeit these could not be observed in one subsample of middle‐aged individuals (Wang et al. Brain Behav Immun. 2022;100:243). Here we hypothesized that functional brain integrity measures would be sensitive to predict CRP levels in this group. We focused on global system segregation (SyS) a graph theory‐based metric which quantifies the extent to which major functional networks are segregated from each other.