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Metabolic pathways of three major SCFAs from carbohydrate fermentation. The gut microbiota synthetizes three major SCFAs, acetate, propionate, and butyrate through dietary fiber. Acetate is synthesized via the Wood-Ljungdahl pathway and pyruvate. Propionate can be produced from the propanediol, succinate, and acrylate pathway. Butyrate is formed through the molecule of acetyl-CoA
