TABLE 1.
Inclusion and exclusion criteria
| Inclusion criteria | Exclusion criteria |
|---|---|
| Population | |
| ‐ Human subjects | ‐ Animal studies |
| ‐ Bariatric procedure (including RYGB, SG, BPD, adjustable gastric banding, gastric bypass) | ‐ Gastrectomy for other medical reasons (not focused on weight loss) |
| ‐ All subjects ≥18 years old | ‐ Abdominal liposuction |
| ‐ Mean BMI ≥ 35 kg/m2 | ‐ Other severe diseases: cancer, lung diseases, kidney diseases, gastrointestinal diseases, cardiovascular diseases or immunodeficiency diseases (except for obesity‐related diseases such as diabetes mellitus type 2, hypertension, arthrosis and sleep apnoea) |
| Study design | |
| ‐ Observational studies | ‐ Cross‐sectional studies |
| ‐ Longitudinal measurements (including a preoperative measurement and ≥1 postoperative measurement) | ‐ Review articles |
| ‐ Control groups of randomized controlled trials | ‐ Intervention groups of randomized controlled trials |
| ‐ Ranges >3 months within one postoperative measurement point | |
| Measurements | |
| ‐ Whole body DXA scan | ‐ BIA |
| ‐ Whole body CT | ‐ Bod Pod |
| ‐ Whole body MRI | |
| Outcome | |
| ‐ Lean body mass / lean mass /lean tissue | ‐ %FFM (percentage of body weight) |
| ‐ Fat‐free mass | |
| ‐ Skeletal muscle mass/muscle mass | |
| Other | |
| ‐ English language | ‐ Abstract only |
| ‐ Full text available | ‐ Conference proceedings |
|
‐ Study protocols ‐ Letter to the editor |
|
| ‐ Case reports |
Abbreviations: BIA, bioelectrical impedance analysis; BMI, body mass index; BPD, biliopancreatic diversion; CT, computed tomography; DXA, dual energy X‐ray absorptiometry; FFM, fat‐free mass; MRI, magnetic resonance imaging; RYGB, Roux‐en‐Y gastric bypass; SG, sleeve gastrectomy.