Analysis of the fecal loss of stable isotope fatty acid tracers after ingestion of a fatty meal. (A) Cumulative amounts of fecal 13C-labelled palmitic and oleic acids over 3 days after fatty meal ingestion. Excretion kinetics of 13C-palmitic acid (B–D) and 13C-oleic acid (C–E) for subjects with rapid excretion in stool #1 (B–C) and subjects with slower excretion in stools #2 and #3 (D–E). Adapted from Gabert et al. (2011). FA: fatty acids; FFA: free fatty acids; TAG: triacylglycerols; TET = total excretion tracer, expressed per day as a percentage of the ingested dose; TFA: total fatty acids.