Normal values for thyroid stimulating hormone are 0.45-4.5 mU/L in most laboratories. thyrotropin is a glycoprotein hormone secreted primarily by the pituitary gland and eosinophils. In the presence of thyrotropin-releasing hormone, it also causes the pituitary gland to synthesize and release thyrotropic hormone. Thyrotropic hormone promotes thyroid cell proliferation, thyroid synthesis and thyroid hormone secretion. The increased secretion of thyroid hormone, followed by feedback inhibition of thyrotropic hormone secretion, is regulated in the body by triiodothyronine, thyroid hormone and the central nervous system in a circadian rhythm. Decrease is seen in secondary hypothyroidism, diffuse goiter with hyperthyroidism, etc. Care should be taken to limit water and high fat diet intake. In hypothyroidism, the kidney’s ability to remove water decreases, so the daily intake of water should not be too much to avoid water intoxication. Patients with hypothyroidism often have hyperlipidemia, so a fatty diet should be restricted and foods that cause goiter should not be consumed.