VOCs	Volatile Organic Compounds
GI	Gastrointestinal
CSCs	Cancer Stem Cells
GC	Gastric Cancer
CRC	Colorectal Cancer
GC-MS	Gas Chromatography–Mass Spectroscopy
SIFT-MS	Selected Ion Flow Tube–Mass Spectrometry
PTR-MS	Proton Transfer Reaction–Mass Spectrometry
ALDH	Aldehyde Dehydrogenase
ADH	Alcohol Dehydrogenase
CYP450	Cytochrome P450
ROS	Reactive Oxygen Species
CYP2E1	Cytochrome P2E1
AODS	Antioxidative Defense System
LCFA	Long-Chain Fatty Acid
acac-COA	Acetoacetyl-CoA
HMGCS2	3-Hydroxy-3-Methlglutaryl-CoA Synthase 2
SLC16A6	Solute Carrier Family 16
TCA	Tricarboxylic Acid
AcAc	Acetoacetyl
SCFAs	Short-Chain Fatty Acids