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Background  Low-grade inflammation has been repeatedly associated with both excess weight and psychosis. However, no previous studies have addressed the direct effect of body mass index (BMI) on basal serum cytokines in individuals with first-episode psychosis (FEP).    Objectives  The aim of this study is to analyze the effect of BMI on basal serum cytokine levels in FEP patients and control subjects, separating the total sample into two groups: normal-weight and overweight individuals.    Methods  This is a prospective and open-label study. We selected 75 FEP patients and 75 healthy controls with similar characteristics to patients according to the following variables: sex, age, and cannabis and tobacco consumption. Both controls and patients were separated into two groups according to their BMI: subjects with a BMI under 25 were considered as normal weight and those with a BMI equal to or more than 25 were considered as overweight. Serum levels of 21 cytokines/chemokines were measured at baseline using the Human High Sensitivity T Cell Magnetic Bead Panel protocol from the Milliplex® Map Kit. We compared the basal serum levels of the 21 cytokines between control and patient groups according to their BMI.    Results  In the normal-weight group, IL-8 was the only cytokine that was higher in patients than in the control group ( p  = 0.001), whereas in the overweight group, serum levels of two pro-inflammatory cytokines (IL-6,  p  = 0.000; IL-1β,  p  = 0.003), two chemokines (IL-8,  p  = 0.001; MIP-1β,  p  = 0.001), four Th-1 and Th-2 cytokines (IL-13,  p  = 0.009; IL-2,  p  = 0.001; IL-7,  p  = 0.001; IL-12p70,  p  = 0.010), and one Type-3 cytokine (IL-23,  p  = 0.010) were higher in patients than in controls.    Conclusions  Most differences in the basal serum cytokine levels between patients and healthy volunteers were found in the overweight group. These findings suggest that excess weight can alter the homeostasis of the immune system and therefore may have an additive pro-inflammatory effect on the one produced by psychosis in the central nervous system.

The effect of excess weight on circulating inflammatory cytokines in drug-naïve first-episode psychosis individuals