evaluating the effect of GFD on thyroid function and autoantibodies in HT patients for 12 months, TSH levels decreased significantly in the intervention group than in controls; however, no significant difference was found in anti‐TPO and anti‐Tg antibodies, FT3 or FT4 levels (p > 0.05) (Pobłocki et al., 2021). This evidence concerns the gene TPO and hematocrit.