| MO | Morbid Obesity |
| SCFA | Short Chain Fatty Acids |
| BMI | Body Mass Index |
| HV | Healthy Volunteers |
| DI | Dysbiosis Index |
| ADI | Alternative Dysbiosis Index |
| NNS | Non-nutritive sweeteners |
| OR | Odds Ratio |
| B | Unstandardized coefficient in the linear regression analyses |
| WHO-5 | WHO Well-being index |
| HSCL-10 | Hopkin Symptom Checklist 10 |
| IBS | Irritable Bowel Syndrome |
| IBS-SSS | Irritable Bowel Severity Scoring System |