Per- and polyfluoroalkyl substances (PFAS) are a large class of synthetic organofluorine compounds renowned for their extraordinary environmental persistence—so much so that they are widely dubbed “forever chemicals.” Their resistance to natural degradation stems from the exceptionally strong carbon–fluorine (C–F) bond, one of the strongest covalent bonds in organic chemistry. This structural feature underpins their thermal stability, chemical inertness, and dual hydrophobic and oleophobic properties—qualities that have driven decades of industrial use in firefighting foams, nonstick cookware, water-repellent textiles, food packaging, semiconductor manufacturing, and medical devices.
This same molecular resilience makes PFAS among the most mobile and enduring contaminants ever introduced into the environment. With estimated environmental half-lives spanning centuries, PFAS do not meaningfully break down under ambient conditions. Their semi-volatility enables repeated cycles of evaporation, atmospheric transport, and deposition—facilitating global dispersion across continents and oceans. Monitoring studies have confirmed detectable PFAS concentrations in remote ecosystems far removed from human activity, including Arctic ice cores, Himalayan snowpacks, and Antarctic marine biota—evidence of truly planetary-scale contamination.
Human exposure is nearly ubiquitous: PFAS bioaccumulate in blood, liver, and kidneys due to slow metabolic clearance and high protein-binding affinity. A 2026 study by researchers at Peking University’s Institute of Reproductive Health examined PFAS exposure in northern Chinese women and found a statistically significant positive association between cumulative exposure to perfluorocarboxylic acids (PFCAs)—a major PFAS subclass—and increased incidence of influenza-like illnesses. In contrast, associations with perfluorosulfonic acids and their emerging alternatives (collectively termed PFSAs+) were not statistically robust, suggesting compound-specific immunomodulatory effects.
Further evidence of metabolic disruption comes from national biomonitoring data analyzed by the Chinese Center for Disease Control and Prevention’s Environmental Health Institute. Using baseline samples from the China National Human Biomonitoring Program (CNHBM), investigators assessed eight PFAS analytes—including PFOA, PFOS, PFNA, PFDA, PFUnDA, PFHxS, PFHpS, and the chlorinated alternative 6:2 Cl-PFESA—and found a significant positive association between serum PFAS concentrations and prediabetes prevalence after adjusting for confounders. Notably, subgroup analysis revealed that habitual seafood consumption attenuated this association—suggesting that certain marine-derived nutrients or compounds may mitigate PFAS-induced glucose dysregulation.
Regulatory action in China has intensified accordingly. PFOS, PFOA, and PFHxS are now listed in the *Key Controlled New Pollutants List (2023 Edition)*, with production bans and strict use restrictions enforced nationwide. In February 2025, draft regulatory documents—including the *Indicative List of Long-Chain Perfluorocarboxylic Acids (PFCAs), Their Salts, and Related Compounds*—were released for public consultation, signaling an expanding regulatory framework targeting both legacy and next-generation PFAS.
For clinicians and public health professionals, these findings underscore the need for heightened awareness of PFAS as modifiable environmental risk factors—not only for endocrine and immune dysfunction but also for cardiometabolic disease. For patients, pragmatic mitigation strategies include selecting PFAS-free cookware, avoiding grease-resistant food packaging, using certified water filtration systems where contamination is suspected, and maintaining a diet rich in diverse whole foods—including seafood, where appropriate—to potentially offset adverse metabolic effects. Advancing safer alternatives and accelerating remediation technologies remain critical priorities for research and policy alike.