GDM	Gestational diabetes mellitus
BMI	Body mass index
LC–MS	Liquid chromatography–mass spectrometry
BACC	Branched-chain amino acids
ESI	Electrospray ionization
UPGMA	Unweighted pair group method with arithmetic mean
LDA	Linear discriminant analysis
OPLS-DA	Orthogonal Partial Least Squares-Discriminant Analysis
KEGG	Kyoto Encyclopedia of Genes and Genomes (KEGG)
OGTT	Oral glucose tolerance test
PCoA	Principal coordinates analysis