1112 people from Moscow region have been surveyed. Genotyping of rs659366 polymorphism UCP2 gene was performed using allele-specific amplification, result detection in real time and using TaqMan-probes complementary DNA polymorphic sites. The study of rs659366 polymorphism of the UCP2 gene has showed that 36.9% of patients had genotype AA, 46.7%--genotype AG, and 16.5%--genotype GG. The frequency of allele A was 60.2%, allele G--39.8%. BMI, value of fat mass, visceral fat area, serum glucose and triglyceride levels were significantly higher in carriers of A allele in the homozygous and heterozygous state than in carriers of G allele in the homozygous state. Frequency of A allele compared with G allele in obese patients (BMI greater than 30 kg/m2) was: OR--1.52; CI (1.24-1.86), p = 0.001, and in diabetes mellitus type 2--OR--1.22; CI (0.910-1.622), p = 0.19.