| CI | Confidence interval |
| DPP-4 | Dipeptidyl peptudase-4 |
| EG | Experimental group |
| GA | Gallic acid |
| HDL | High-density lipoprotein |
| INS1-E | Insulin-secreting rat insulinoma |
| MA | Meta-analyses |
| MD | Mean difference |
| MS | Metabolic syndrome |
| PRISMA | Preferred Reporting Items for Systematic Reviews and Meta-Analyses |
| S. edule | Sechium edule |
| SD | Standard deviation |
| SR | Systematic review |
| STZ | Streptozotocin |
| T2DM | Type 2 diabetes mellitus |