Lipid, protein and carbohydrate metabolism was studied in patients with alimentary obesity as was the effect on that metabolism of the diets containing horseflesh and beef. The majority of the obese patients showed an increased content of all lipid fractions (phospholipids, cholesterol, free fatty acids, triglycerides), of very low and low density lipids, and a reduced content of high density lipoproteins. Normolipoproteinemia was only ascertained in 26.6% of the patients. Hyperlipoproteinemia (HLP) Ila was detected in 26.6% of the patients. HLP Ilb in 14.5 and HLP IV in 32,3 of the patients. Disorders of the glucose tolerance test (GTT) were revealed in 24% of the patients. Of these, 10% had low curves of the GTT, 6.5% questionable, and 7.5% of the patients manifested diabetic curves. In addition, all the patients had an increased basal level of immunoreactive insulin. Hyperproteinemia was discovered in 61.7, hypoalbuminemia in 74.9, and dysglobulinemia in 50 to 86% of the patients. Apart from an appreciable reduction of the excess body weight, the dietetic management produced the normalization and improvement of the indicators under study in the overwhelming majority of the patients. It should be noted that a more noticeable effect was attained after the dietetic management with the use of horseflesh.