Evidence map›Paper›PMID 40782191›Full record

SynthesisProbiotics and antimicrobial proteins2026

Effects of Probiotic and Synbiotic Supplementation on Glycemic Indices in Adult Individuals with Prediabetes and Type 2 Diabetes Mellitus: A Grade-Assessed Systematic Review and Dose-Response Meta-analysis of RCTs.

Azin Setayesh, Mehdi Karimi, Mohammad Amin Karimi, Samira Pirzad, Mahdis Heydari, Omid Asbaghi, Sayed Hossein Davoodi, Bagher Larijani

Abstract readSystematic ReviewMeta-Analysis
In one paragraph

Synthesis in Probiotics and antimicrobial proteins, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.

0numbers the graph read from it
0cells of the map it votes in
6citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

6 citing papers in PubMed.

  1. Review
  2. Review
  3. Article
  4. Review
  5. Article
  6. Review
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

8 authors.

Azin SetayeshDepartment of Community Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences (TUMS), Tehran, Iran.ORCID http://orcid.org/0009-0007-4305-9992
Mehdi KarimiFaculty of Medicine, Bogomolets National Medical University (NMU), Kyiv, Ukraine. Karimi9010@gmail.com.ORCID http://orcid.org/0009-0006-4388-0214
Mohammad Amin KarimiSchool of Medicine, Shahid Beheshti University of Medical Sciences (SBUMS), Tehran, Iran.ORCID http://orcid.org/0000-0002-0638-1743
Samira PirzadFaculty of Medicine, Islamic Azad University, Tehran Medical Sciences Branch (IAUTMU), Tehran, Iran.ORCID http://orcid.org/0009-0003-9220-3891
Mahdis HeydariStudent Research Committee, Bushehr University of Medical Sciences, Bushehr, Iran.ORCID http://orcid.org/0009-0008-3157-9453
Omid AsbaghiCancer Research Center, Shahid Beheshti University of Medical Sciences (SBUMS), Tehran, Iran.ORCID http://orcid.org/0000-0002-7740-4711
Sayed Hossein DavoodiNational Nutrition and Food Technology Research Institute, Shahid Beheshti University of Medical Sciences (SBUMS), Tehran, Iran. hdavoodi@sbmu.ac.ir.ORCID http://orcid.org/0000-0002-6404-8367
Bagher LarijaniEndocrinology and Metabolism Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences (TUMS), Tehran, Iran. Larijanib1340@gmail.com.ORCID http://orcid.org/0000-0001-5386-7597

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Probiotic and synbiotic supplementation has garnered attention for its potential to modulate metabolic parameters, including glycemic control, in individuals with prediabetes and type 2 diabetes mellitus (T2DM). This systematic review and dose-response meta-analysis aims to evaluate the effectiveness of these supplements on glycemic indices, synthesizing evidence from randomized controlled trials (RCTs) with grade-assessed methodologies. A comprehensive search of scientific databases was conducted from inception through January 2025 to identify RCTs assessing the effects of probiotic and synbiotic supplementation on glycemic indices, including fasting blood glucose (FBG), fasting insulin (FI), hemoglobin A1c (HbA1c), and homeostatic model assessment for insulin resistance (HOMA-IR). Eligible studies were screened; relevant data were extracted, and the quality of evidence was evaluated using the GRADE approach. Statistical analyses were performed using STATA to generate pooled results. The pooled analysis of 48 RCTs demonstrated that probiotics and synbiotics supplementation significantly decreased FBG (WMD: - 7.00 mg/dL), FI (WMD: - 1.72 µIU/mL), HbA1c levels (WMD: - 0.34%), and HOMA-IR (WMD: - 0.91), with a substantial heterogeneity across all outcomes (p < 0.001). Subgroup analyses indicated reductions in FBG, FI, HbA1c, and HOMA-IR across varying baseline characteristics, including glycemic levels, trial durations, and participant health status. Both probiotics and synbiotics were effective, with notable benefits for patients with T2DM, longer intervention durations, and higher baseline BMI. Meta-regression and dose-response analyses revealed no significant association between the duration of probiotic and synbiotic supplementation and changes in glycemic indices. Probiotic and synbiotic supplements significantly reduce FBG, FI, HbA1c, and HOMA-IR, leading to improvements in glycemic markers in individuals with prediabetes and T2DM. These supplements can be used as effective adjunctive strategies to enhance glycemic control, highlighting the promising role of gut microbiota modulation in diabetes management.

Indexed as

Diabetes Mellitus, Type 2Glycemic IndexPrediabetic StateProbioticsSynbioticsAdultBlood GlucoseDietary SupplementsGlycated HemoglobinHumansRandomized Controlled Trials as TopicBlood GlucoseGlycated HemoglobinDiabetesGlycemic markersMeta-analysisMetabolismNutritionProbioticSynbiotic

Identifiers

PMID40782191
PMCPMC13013336

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC-ND
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.