The goal of this clinical trial is to to study the effect of Optifiber PHGG on carbohydrate metabolism in patients with type 2 diabetes mellitus. The main questions it aims to answer are:

1. To study in detail the effect of Optifiber HCTK on carbohydrate metabolism in patients with type 2 diabetes mellitus.
2. To study the effect of Optifiber HCTK on the lipid profile of patients with type 2 diabetes mellitus.
3. To study the effect of Optifiber HCTK on the metabolites of the intestinal microbiota in patients with type 2 diabetes mellitus.
4. To study the effect of Optifiber HCTK on weight loss and waist circumference reduction in patients with type 2 diabetes mellitus.

The observational study is planned to include approximately 80 patients diagnosed with type 2 diabetes mellitus, with 40 patients divided into the main and control groups. In the control group, the necessary information will be collected retrospectively using archived patient data. In the main (study) group, data will be collected prospectively.

Inclusion Criteria:

• Type 2 diabetes mellitus;
• The duration of the disease is less than 5 years;
• Age from 45 to 60 years;
• HbA1c up to 7.5%;
• Body mass index from 27 to 35 kg/m2;
• Patients who were assigned flash monitoring to control carbohydrate metabolism and complex therapy as part of routine clinical practice;
• Voluntary informed consent to participate in the study.

Exclusion Criteria:

• Use of antidiabetic drugs other than metformin, DPP-4 inhibitors or SGLT2 inhibitors
• Intestinal diseases (ulcerative colitis, Crohn's disease, etc.)
• Pregnancy
• AIDS/HIV
• The use of other dietary fibers.
• Participation in another clinical trial within the last 30 days or simultaneous participation in another clinical trial.