| 25(OH)D | 25-hydroxyvitamin D |
| BAT | Brown Adipose Tissue |
| BMI | Body Mass Index |
| BPD | Biliopancreatic diversion |
| BS | Bariatric Surgery |
| ERAS | Enhanced Recovery after Surgery |
| EWL% | Excess Weight Loss Percentage |
| GB | Gastric Banding |
| LSG | Laparoscopic Sleeve Gastrectomy |
| LCD | Low Calorie Diet |
| MDs | Micronutrient Deficiencies |
| OAGB | One-anastomosis gastric bypass |
| RYGB | Roux-en-Y Gastric Bypass |
| SG | Sleeve Gastrectomy |
| TWL% | Total Weight Loss Percentage |
| VLCD | Very Low Calorie Diet |
| VLCKD | Very Low Calorie Ketogenic Diet |