| FGIDs | functional gastrointestinal disorders |
| IBDs | inflammatory bowel diseases |
| UC | ulcerative colitis |
| CD | Chron’s disease |
| HP | Helicobacter pylori |
| IBS | irritable bowel syndrome |
| FD | functional dyspepsia |
| DCs | dendritic cells |
| TNF-α | tumor necrosis factor-α |
| ILs | interleukins |
| IFNs | interferons |
| Treg cells | regulatory T cells |
| Teff cells | effector T cells |
| NETs | neutrophil extracellular traps |
| ROS | reactive oxygen species |
| LDGs | low-density granulocytes |
| INFIs | type I interferons |
| PRRs | pattern recognition receptors |
| PAMPs | pathogen-associated molecular patterns |
| DAMPs | danger-associated molecular patterns |
| NK cells | natural killer cells |
| Th1 cells | T helper cells type 1 |
| T2D | type 2 diabetes |
| CVD | cardiovascular diseases |
| TGF-β | transforming growth factor-β |
| naAbs | natural antibodies |
| HPA | hypothalamic-pituitary-adrenal |
| ILC1s | innate lymphoid cells type 1 |
| ILC2s | innate lymphoid type 2 cells |
| LPSs | lipopolysaccharides |
| SCFAs | short-chain fatty acids |
| BCFAs | branched-chain amino acids |
| IgA | immunolobulin A |
| FDCs | follicular dendritic cells |
| Thf cells | follicular Th cells |
| CNS | central nervous system |
| PDS | postprandial distress syndrome |
| EPS | epigastric pain syndrome |
| ENS | enteric nervous system |
| ANS | autonomic nervous system |
| ECCs | enterochromaffin cells |
| 5-HT | 5-hydroxytryptamine |
| TPH1 | tryptophan hydroxylase 1 |
| PI-IBS | post-infection irritable bowel syndrome |
| EoE | eosinophilic esophagitis |
| Th17 | T-helper 17 |
| TSLP | thymic stromal lymphoprotein |
| iNKT cells | invariant natural killer T cells |
| ILC3s | innate lymphoid type 3 cells |
| CRF | corticotropin-releasing factor |
| CRP | C-reactive protein |
| LBP | lipopolysaccharide binding protein |
| IFABP | intestinal fatty acid binding protein |