The thyroid damage caused by SDM and iodine deficiency was confirmed with serum TSH, thyroid hormones and thyroid histopathology analysis, cytosolic glutathione peroxidase (GPX1), thioredoxin reductase in the thyroid, plasma GPX3 and CAT, and erythrocyte GPX1 [4, 10, 11]; usefulness and applicability in investigation of food influence on the thyroid function were also tested [4]. This evidence concerns the gene GPX1 and thyroiditis.