Characteristic features of indicators of the thyroid status and lipoprotein content were found in blood serum of girls and women representing Buryat ethnos and europeoids. In representatives of Buryat ethnos, as compared to europeoids, a development of adaptive reactions from the side of pituitary-thyroid part of the neuroendocrine regulation system was noted (increased concentrations of free T3 fraction in girls and decreased TTH levels in women). Changes in lipid metabolism parameters lie in lower concen- trations of atherogenic fractions of cholesterol in Buryat girls and increased level of cholesterol-contai- ning blood components in adolescent europeods. At older age period a reverse tendency is observed, cha- racterized by an increased activity of lipid metabolism in representatives of the indigenous nationality.