The current investigations on fatty acids are focused on long chain fatty a
cids, trans fatty acids (TFA) and conjugated fatty acids (CFA), especially
isomers of linoleic acid (CLA). This paper deals with the origins of TFA an
d CLA and their physiological significance. Furthermore an overview is give
n of analytical procedures of both TFA and CLA. In addition the contents an
d isomeric distribution of these groups of fatty acids in foods are present
ed.