PBDEs are endocrine disrupting chemicals used in soft furnishings and electronics. They disrupt T3 binding to peripheral receptors (but not pituitary receptors) leading to hypothyroidism with normal hormone levels ibshypo.com/index.php/acqui... . They also reduce T4 to T3 conversion in the brain pmc.ncbi.nlm.nih.gov/articl... .
This recent study also reveals an association between upper tertile PBDE levels and a 300% higher risk of cancer mortality:
Liu B, Lehmler H, Ye Z, et al. Exposure to Polybrominated Diphenyl Ethers and Risk of All-Cause and Cause-Specific Mortality. JAMA Netw Open. 2024;7(4):e243127. doi:10.1001/jamanetworkopen.2024.3127