Liquid triglycerols (Oils) have high proportions of unsaturated fatty acids. Protection – e.g. R'COOH and R"COOH can be all different, all the same, or only two the The density of LDL is between 1.019 and 1.063 g/mL and ranges in diameter from 18 to 28 nm. Lipids are the substance of animal and plant origin. INTRODUCTION