Unsaturated fats such as omega-3, omega-6, oleic acid, and linoleic acids are the good fats! Incorporating these into your diet can actually help you lose weight! The fat-soluble vitamins A, D, E, and K all require fat so that they can be absorbed into the body. Without fat, you will not be getting any of these essential vitamins. Foods high in unsaturated fats such as avocado, can actually keep you feeling full longer because they can take a longer time to digest.