Fatty acids are organic acids with at least one carboxyl (-C(=O)OH, -COOH or -CO2H) group and a long carbon chain that can be joined by double bonds, as in unsaturated fatty acids, or single bonds ...

“Naturally occurring trans-fats, also called cis fatty acids, are created in the guts of certain animals and mainly found in products made by these animals, generally dairy and meat,” she says.