In summary, the capability of 1H LF-NMR energy relaxation time sensor to monitor the TD fingerprint peaks in 2D graphics of chemical and structural changes of linseed oil bodies emulsion (LSE) and linseed emulsion enriched with fish oil (LSFE) in thermal autoxidation conditions was demonstrated. Furthermore, the efficacy of LSE as autoxidation protected fish oil PUFA-rich delivery system was shown.