text: what fats are good and what fats are bad in the body?   the good fats are monounsaturated fats  and polyunsaturated fats. monounsaturated fats lower total cholesterol and ldl cholesterol (the bad cholesterol) and increase the hdl cholesterol (the good cholesterol). nut, canola and olive oils are high in monounsaturated fats. polyunsaturated fats also lower total cholesterol and ldl cholesterol. seafood like salmon and fish oil, as well as corn, soy, safflower and sunflower oils are high in polyunsaturated fats. omega 3 fatty acids belong to this group.  the bad fats are saturated fats and trans fats.  saturated fats raise total blood cholesterol as well as ldl cholesterol (the bad cholesterol). saturated fats are mainly found in animal products such as meat, dairy, eggs and seafood. some plant foods are also high in saturated fats such as coconut oil, palm oil and palm kernel oil.  trans fats are invented as scientists began to "hydrogenate" liquid oils so that they can withstand better in food production process and provide a better shelf life. as a result of hydrogenation, trans fatty acids are formed. trans fatty acids are found in many commercially packaged foods, commercially fried food such as french fries from some fast food chains, other packaged snacks such as microwaved popcorn as well as in vegetable shortening and hard stick margarine.