I was browsing the interweb and discovered this weighty pile of research and theory,
https://www.ncbi.nlm.nih.gov/books/NBK343489/
and thought, wow, retention theory sounds possible! But then I had a good look at this,
https://www.ncbi.nlm.nih.gov/books/NBK343489/bin/lipid_athero-Image001.jpg...