Answer:
Unsaturated lipids have a double bond between carbons that reduces the number of bonded H and causes a bend in the fatty acid chain. Saturated lipids have no double bonds. Lipids with more than one double bond are polyunsaturated fatty acids. And trans fats are lipids with multiple double bonds that occur in such a way that the carbon chain appears straight though it has 2 double bonds so the body cannot digest it properly.