Clinical management strategies for type 2 diabetes mellitus with metabolic dysfunction-associated fatty liver disease: an umbrella review of systematic reviews and meta-analyses

Background: Metabolic dysfunction-associated fatty liver disease (MAFLD) and type 2 diabetes mellitus (T2DM) frequently coexist, showing a bidirectional relationship. MAFLD increases the risk of T2DM, while T2DM independently raises the likelihood of MAFLD. Methods: A comprehensive review was carried out on recent systematic reviews and meta-analyses by searching databases including PubMed, Embase, Web of Science, and the Cochrane database of systematic reviews, covering studies from inception to February 2025. Additionally, manual searches of reference lists were conducted. Inclusion criteria involved systematic reviews and meta-analyses of randomized controlled trials (RCTs) evaluating treatment effects on health outcomes in individuals with T2DM and MAFLD. Results: The search yielded 19 meta-analyses and 112 health outcomes from 622 unique articles. Most analyses focused on treatment effects on endocrine metabolic outcomes (n = 28), lipid metabolic indicators (n = 26), liver health indicators (n = 34), and body composition indicators (n = 24). High-quality evidence indicates that high-intensity interval training improves insulin resistance and low-density lipoprotein cholesterol levels. High-quality evidence also indicates sodium-glucose cotransporter-2 (SGLT-2) inhibitors improved liver proton density fat fraction and fatty liver index, while glucagon-like peptide-1 receptor agonists (GLP-1RAs), particularly liraglutide, enhanced subcutaneous adipose tissue (SAT). Moderate-quality evidence shows that dipeptidyl peptidase-4 (DPP-4) inhibitors enhanced insulin resistance and GLP-1RAs benefited triglycerides, aspartate transaminase, liver fat, and visceral adipose tissue. SGLT-2 inhibitors improved controlled attenuation parameter, body mass index (BMI), SAT, visceral fat mass, and moderate-intensity continuous training improved triglycerides and high-density lipoprotein cholesterol. Fifty-six outcomes were rated as low-quality evidence, and five as very low-quality. Discussion: GLP-1RAs, SGLT-2 inhibitors, DPP-4 inhibitors, exercise, and Chinese Herbal Medicines benefited liver health, glycemic control in T2DM with MAFLD, and impacted body composition and lipid metabolism.