Dietary Supplementation With Leucine or in Combination With Arginine Decreases Body Fat Weight and Alters Gut Microbiota Composition in Finishing PigsOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
Researchers tested whether dietary leucine, alone or combined with arginine or glutamic acid, changes body fat weight, gut microbiota, and short-chain fatty acids in pigs.
How was it studied?
Forty-eight pigs were assigned to four diet groups: a basal alanine-supplemented control, leucine alone, leucine plus arginine, or leucine plus glutamic acid. Colonic short-chain fatty acids, gut microbiota composition, and lipolysis-related gene expression were measured.
What did they find?
Leucine alone or with arginine decreased body fat weight and increased colonic propionate and butyrate versus control, alongside higher lipolysis gene expression. Actinobacteria rose with leucine alone, while Clostridium_sensu_stricto_1, Terrisporobacter, and Escherichia-Shigella rose with leucine plus arginine. Deinococcus-Thermus correlated negatively with body fat and positively with butyrate, propionate, and isobutyrate.
Why it matters
These findings link specific amino acid supplementation to reduced fat mass through gut microbiota and short-chain fatty acid changes, suggesting a potential dietary strategy for obesity.