| DIO | diet-induced obesity |
| Fun | fungiform papillae |
| HFD | high fat diet |
| IDO-1 | indolamine 2,3-dioxygenase |
| Kyn | kynurenine |
| KynA | kynurenic acid |
| L | lean |
| LA | linoleic acid |
| LC-MS/MS | liquid chromatography mass spectrometry |
| LPS | lipo-polysaccharides |
| 1MT | 1-methyl tryptophan |
| NMDAR | N-methyl D-aspartyl receptor |
| OGTT | oral glucose tolerance test |
| QA | quinolinic acid |
| Trp | tryptophan |
| RYGB | Roux-en-Y gastric by-pass |
| VSG | vertical sleeve gastrectomy |
| Xg. | xanthan gum |