| CAT | Catalase |
| EVOO | Extra virgin olive oil |
| FF | Fast-food diet |
| HT | Hydroxytyrosol |
| IBD | Inflammatory bowel disease |
| IBS | Irritable bowel syndrome |
| MD | Mediterranean diet |
| MUFA | Monounsaturated fatty acid |
| NO | Nitric oxide |
| ROS | Reactive oxygen species |
| SCFA | Short-chain fatty acid |
| VD | Vegetarian diet |