13C-GBT, 13C-glucose breath test; 13C-glucose; ALT, alanine aminotransferase; AML, acute myeloid leukemia; ANOVA, analysis of variance; AST, aspartate aminotransferase; AUC, area under the curve; BIA, bioelectrical impedance analysis; BMI, body mass index; Breath test; CF-IRMS, continuous flow isotope ratio mass spectrometer; CGM, continuous glucose monitor; CRP, C-reactive protein; Cmax, maximum peak enrichment in 13CO2 oxidation; ER, endoplasmic reticulum; FFM, fat free mass; FM, fat mass; G-CSF, granulocyte colony-stimulating factor; G6P, glucose-6-phosphate; G6PT, glucose-6-phosphate translocase; G6Pase-ß, glucose-6-phosphatase-ß; G6Pase-α, glucose-6-phosphatase-α; GGT, gamma glutamyltransferase; GSD I, glycogen storage disease type I; GSD III, glycogen storage disease type III; GSD Ia, glycogen storage disease type Ia; GSD Ib, glycogen storage disease type Ib; Glycogen storage disease type Ib; Glycosade®; HSCT/BMT, hematopoietic stem cell transplantation / bone marrow transplantation; Hematopoietic stem cell transplantation; IBD, inflammatory bowel disease; IM, intramuscular; NG, nasogastric; TBW, total body water; UCCS, uncooked cornstarch; Uncooked cornstarch; VCO2, rate of carbon dioxide production.; tmax, time to reach maximum 13CO2 oxidation