: Soy protein with isoflavones has favorable effects on endothelial function that are independent of lipid and antioxidant effects in healthy postmenopausal women. Am. J. Clin. Nutr. 78,[123][124][125][126][127][128][129][130]. West SG, Hilpert KF, Juturu V et al. (2005): Effects of including soy protein in a blood cholesterol-lowering diet on markers of cardiac risk in men and in postmenopausal women with and without hormone replacement therapy. J. Womens Health (Larchmt). 14(3), 253-262. 8. Eugene A. Borodin, Iraida G. Menshikova, Vladimir A. Dorovskikh, Natalya A. Feoktistova et al. (2009 We present the results of the study of the effect of long-term soy intake on the content of some lipids and products of their oxidative modification in the blood, liver and brain of rats, and attempts are made to use them to explain the ability of soya that we have es-tablished to prevent a decrease in the cognitive abilities of rats in adulthood growth [6].The study was performed on white laboratory rats (18 males and 24 females). The animals of the control group received a standard diet, and the experimental three days a week the standard di-et, and four days boiled soya. A detailed description of the conditions of feeding of rats was de-scribed earlier [6]. The animals were removed from the experiment at the age of 15 month. Blood plasma, erythrocyte mass, liver and brain tissue were analyzed. Biochemical parameters of blood plasma were determined with the help of standard reagent sets on the biochemical semi-automatic analyzer Stat Fax 1904+. Lipids were extracted from the erythrocyte mass, liver and brain samples of the rats using Folch method [12]. In the lipid extracts, the content of total lipids was determined gravimetrically, cholesterol, phospholipids, diene conjugates and hydroperoxides with color reac-tions [1]. UV absorption spectra of lipid extracts were recorded on a UNICO 2804 spectrophotome-ter [9]. The fatty acid composition of brain lipids in the combined extracts of the control and exper-imental groups of rats was studied by gas-liquid chromatography of methyl esters of fatty acids on the gas-liquid chromatogram Crystal 2000M, column DB-23, carrier gas-purity 0.9999. Chromato-gram analysis was performed using the Chromatec Analytic 2.5 program [5].Feeding rats with large quantities of soy for a lifetime did not affect the rates depending on the nature of the diet, and the animals receiving the enriched diet did not differ in the content of total protein, glucose, cholesterol, triglycerides, and activity of alanine aminotransferase ( ALAT) in the blood plasma with vivo-control group. The sex of the animals did not matter.There were no differences in the content of total lipids, cholesterol, phospholipids and vitamin E in erythrocytes, depending on the sex of the animals. The only changes in the lipid composition and oxidation state of the erythrocyte lipids in the experimental and control group included a mod-erate increase in cholesterol by 28% and a decrease in the content of diene conjugates also by ...