1 Eat foods high in unsaturated fats like fatty fish (salmon, mackerel, tuna) instead of meats high in saturated fat. 2  Incorporate foods high in polyunsaturated and monounsaturated fats like avocados, nuts, and olive oil into your salads instead of using products high in saturated fats like mayonnaise based dressings. Canola, olive, and peanut oils, and avocados are sources of monounsaturated fat. 2  Both types of unsaturated fats may help lower your blood cholesterol level when used in place of saturated fat in your diet.