Short-chain fatty acids (SCFAs) are compounds considered as postbiotics, which are of increasing interest to the scientific community for their beneficial effects on our health. But what are they?    Short-chain fatty acids are molecules of up to 6 carbon atoms, produced by certain bacteria of the gut microbiota in the colon. These microbial metabolites are derived from the fermentation of complex carbohydrates, the fibres, which could not be digested and assimilated. Their production therefore depends on the bacterial species present in the intestinal microbiota, the type of fibre but also the transit time. These metabolites exist in different forms such [...]