Is trans fat an unsaturated fatty acid that has been changed to a polyunsaturated fatty acid?

Trans fat is a type of unsaturated fatty acid, but it is not simply a changed polyunsaturated fatty acid. Instead, trans fats are created through a process called hydrogenation, which converts liquid vegetable oils into solid fats. This process alters the chemical structure of the fatty acids, resulting in trans isomers that can have negative health effects. Therefore, while trans fats are unsaturated, they are distinct from polyunsaturated fatty acids.