There’s more to avocados than just guacamole. They give you oleic acid, which helps lower the bad cholesterol in your bloodstream. Try putting a few slices on your sandwich, or add them to a salad. Avocado oil, which has a subtle, sweet flavor, can also be used in place of other oils in cooking. Both polyunsaturated and monounsaturated fats can help lower blood cholesterol levels, making avocados a heart-healthy food.