What are trans fats?

Question

are they

hydrogenated vegtable oils that have health risks?

fats made from cholesterol that are components of paques in the walls of blood vessels?

fats derived from animal sources and are assoc. with cardiovascular disease?

fats that contain trans double bonds and may contrib to atherosclerosis?

or polyunsaturated fats produced by removing H from fatty acids and forming cis doubls bonds?

Answer 1

They are fats that contain trans- double bonds.  They form during partial hydrogenation (but not complete hydrogenation) of (unsaturated) vegetable fats.