The first link is "High exposure to perfluorinated compounds in drinking water and thyroid disease" but the conclusion in the abstract is
> In total, 16,150 individuals had ever been exposed. The hazard ratios did not indicate any excess risk of hyperthyroidism among those with contaminated water. For hypothyroidism, the risk of being prescribed medication was significantly increased among women with exposure during the mid part of the study period (but not men). However, the association with period of exposure was non-monotonic, so the significance is considered to be a chance finding. Our research was limited by the relatively simple exposure assessment.
The second one as well
> No association between serum PFAS and fecal zonulin was found. In conclusion, the present study found no consistent evidence to support PFAS exposure as a risk factor for IBD.