Funding: the study was conducted as part of the State Assignment № 0373100122119000041, the project “Creation of a bank of blood serum and fecal samples from healthy donors and patients with obesity, metabolic syndrome, type 2 diabetes mellitus, impaired mucosal barrier of the gastrointestinal tract with the aim of identifying candidate species-specific mediators of quorum sensing microbiota systems human modulating endocrine and metabolic function of adipose tissue”.

Author contribution: Ganenko LA — study concept, data acquisition and analysis, manuscript writing; Volkova NI — research planning and management, manuscript editing; Roumiantsev SA — study design, manuscript editing; Grigoryeva TV — working with the database, analysis of the results; Laikov AV — data analysis and interpretation of the results; Vasilyev IYu — study concept, manuscript editing; Gaponov AM — literature review, study design, manuscript editing; Naboka YuL — data analysis and interpretation of the results, manuscript editing; Shestopalov AV — search for sources of funding, working with data sets, statistical data processing, manuscript writing.

Compliance with ethical standards: the study was approved by the Ethics Committee of the Rostov State Medical University (protocol № 20/19 of 12 December 2019); the informed consent was submitted by all study participants.