摘要Objective To investigate the associations between eight serum per-and polyfluoroalkyl substances(PFASs)and regional fat depots,we analyzed the data from the National Health and Nutrition Examination Survey(NHANES)2011-2018 cycles.Methods Multiple linear regression models were developed to explore the associations between serum PFAS concentrations and six fat compositions along with a fat distribution score created by summing the concentrations of the six fat compositions.The associations between structurally grouped PFASs and fat distribution were assessed,and a prediction model was developed to estimate the ability of PFAS exposure to predict obesity risk.Results Among females aged 39-59 years,trunk fat mass was positively associated with perfluorooctane sulfonate(PFOS).Higher concentrations of PFOS,perfluorohexane sulfonate(PFHxS),perfluorodecanoate(PFDeA),perfluorononanoate(PFNA),and n-perfluorooctanoate(n-PFOA)were linked to greater visceral adipose tissue in this group.In men,exposure to total perfluoroalkane sulfonates(PFSAs)and long-chain PFSAs was associated with reductions in abdominal fat,while higher abdominal fat in women aged 39-59 years was associated with short-chain PFSAs.The prediction model demonstrated high accuracy,with an area under the curve(AUC)of 0.9925 for predicting obesity risk.Conclusion PFAS exposure is associated with regional fat distribution,with varying effects based on age,sex,and PFAS structure.The findings highlight the potential role of PFAS exposure in influencing fat depots and obesity risk,with significant implications for public health.The prediction model provides a highly accurate tool for assessing obesity risk related to PFAS exposure.