Replace one meat course a day with a vegetarian dish. You can lace your guacamole with onion, hot chili peppers, garlic and lemon juice and sprinkle it with chopped nuts such as hazelnuts, macadamias, pistachios, cashews, peanuts or Brazil nuts. All of these nuts are rich in monounsaturated fatty acids, beneficial fats that are good for your heart, among other things. Use olive oil. Corn oil and other vegetable oils are polyunsaturated oils.
Olive oil is a monounsaturated oil.
There is a complex chemical explanation for how these differ, but all you really need to know is that there's good reason to believe that monounsaturated oils are a lot better for you. In salad dressings, replace polyunsaturated oils with olive oil. Eat a wide variety of fruits and vegetables. Also eat a good selection of herbs, legumes, nuts and spices. These are the foods that our ancestors consumed back in the days before the invention of burgers, hot dogs, pizza, ice cream and all the junk we eat today.